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Does /g/ use a power bank? if so, which one and why?

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Thread replies: 181
Thread images: 32

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Does /g/ use a power bank?

if so, which one and why?
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I can't find it for sale anymore and it only has one USB port which is irritating- but it's huge (20000mAh) and it can charge laptops.
>>
>>47175109

I carry my ChinkPad™ with me everywhere. If my phone runs out of power I just plug it in a USB port. :^)
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>>47175109
I have this, it's breddy gud but I hardly ever need to use it

will be useful for travel in the summer tho
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>>47175332
I have this exact one. It's a bit large, good for a bag, but I'm considering getting a smaller one to carry in my jacket at all times
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>>47175380
I've been thinking exactly the same thing lately tbh, there's a cheap little 3000mah anker on amazon that looks about right
>>
I bought a small 3000mAh one in Tokyo last year since the phone suddenly got a lot of use to look shit up and arrange meetings with jp gf over Line.
>>
I'm not a cuck who buys a phone with anything less than 24-hour battery life.
>>
This. Pretty great.
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>>47175613
>living a life so boring that you're never away from power outlets for more than 24 hours
>>
I wish there existed a power bank that can steal every picture from connected phones and copy them to a local memory, also charge the phone
>>
I got a power box for 5$, it's pretty gud.
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>>47175923
Nothing would ever be available to the consumer market.

Making one wouldn't be to hard though. Well it would be time consuming, and require technical knowledge and software design.

Also no matter what you do, the pop up will display asking if the user trusts this device on iPhones and on Android it would display a notification that data transmission was active, which doesn't appear when you just plug your phone in to charge.

This would still get the majority of users, but who is going to ask a stranger to use their power bank?
>>
>>47175959
I have lots of friends who routinely ask me to use my power bank and probably wouldn't even notice the transfer thing
>>
>>47175648
>Mobile personal cloud solutions

I've thought about this before. A device I could stick in my purse that I can connect SD and USB drive to, that also has a power bank attached to it if the battery get slow, but otherwise broadcasts a low range wifi signal for my phone to connect to for additional storage options. Always thought the idea was really cool.
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>>47175959
Like anyone wouldn't just dismiss the notification and trust it
>must be a bug lol
>>
>>47175986
are you a qt trap? :3
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>>47176006
Yes. At least my gf thinks so, any ways

>>47175985
Yeah ok but why would you wanna creep on your friends like that? Seems weird, I mean I guess I should check where I am, but still, damn.

>>47176001
I work in a photolab, where we have kiosks users can plug their phones into. I'd say the majority of people just blindly hit trust, but it's hard to tell. I've only had I think one person ever ask me if it was a legitimate question, to which I responded of course "yes that's apple security software, lol. Our Kiosk is probably not going to haxxor you though." She laughed. I sighed.
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>>47176090
>transbian

dropped
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>>47176212
Shit my bad, man!
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>>47176266
>accidentally ate gluten
I hope they die
>>
How hard is it to make a powerbank out of this?
Can I buy a transformer from 12V to 5V?
>>
>>47176592
This questions belongs on diy. Link back here, because I'm curious to, and I bet those nerds know whats up.

>>>/diy/
>>
>>47176612
Yeah I ain't going to that board.
I just googled it and found this nifty little converter.
http://www.ebay.com/itm/DC-DC-Converter-Module-12V-To-5V-Duble-USB-Output-Power-Adapter-3A-15W-/321645899181

So yeah it's totally doable.
>>
>>47176646
>Yeah I ain't going to that board.
Why not?

Good info tho. Based google.
>>
>>47176646
>ebay

http://www.amazon.com/Autek-Converter-convert-adapter-DCCON-5U-0/dp/B00BMIVFK8
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>>47176821
Isn't that the exact same thing?
What's wrong with ebay?
>>
>>47176719
I have bad memories.
>>
>>47176889
nothing but Amazon is just better in ever possible way
>>
>>47176889
Never had a good experience with ebay. Don't like their set up. Prefer amazon much more.

>>47176947
I'm sorry.
>>
>>47176981
I found the same thing cheaper and with free shipping.
Note that I don't live in the US and shipping from US costs around 10$ minimum.
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>>47176995
pls link
>>
>>47176947
did /diy/ fuck your girl on a workbench in a tiny house and put screw drivers in her ass while screaming 'read the fucking sticky' or something?
>>
>>47177026
http://www.ebay.co.uk/itm/291361046284?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
>>
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I bought this one for a friend's birthday, and so far he's really happy with it. His phone has a 2650mAh battery and he gets about 3 charges out of it, and it charges pretty quickly too.

The name is "Aukey 8000mAh"
>>
>>47177036
It was my wife. In a shed. With a diy wood lathe.
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>>47177038
does it come with that pouch? it looks nice
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>>47177047
Yeah, it comes with the pouch in the pic. It has a soft touch and it has a little pocket to put the charging cable in.

It's quite nice, and as I said it charges pretty quickly (as fast as AC charging).
>>
>>47177044
im sorry anon.
they got my gf too.
it was on a handmade table and afterwards they made me look at the pictures on a restored 1950s television they converted into a computer monitor
>>
>>47177037
thx bb
>>
>>47177139
Did you call me baby? What the fuck man.
>>
OP just reminded me i need to buy one of these make my phone last longer now if only i could do the same with my 3DS
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>>47177158
srry bb :^(
>>
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Have an Anker. Part because I did the Amazon prime trial during the Christmas season and was pretty much just buying stuff for the free shipping.
Looking back, I kind of wish I bought the HooToo Tripmate Elite instead. I bought the nano during my shopping spree and usually plug it into the Anker. The Elite would've made things more convenient.
>>
>>47177178
Why can't you?
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>>47177209
i dont think the 3DS has a USB charge adapter
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>>47175109
i use a genious ECO-u821 power bank for ingress
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>>47177254
>ingress
>waste of gas the game

>>47177228
That's weird as fuck. Fucking handheld consoles.

I can't wait for nintendo to ditch their hand held consoles altogether and start publishing exclusively on mobile markets. Or do both at the same time, modern phones have at least as much power as this last generation of DS consoles.
>>
>>47176561
Maybe their dicks will fly off
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>>47177388
Only if you live in a shit place and/or are fat.
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Xiaomi power banks are good.

They have good batteries inside, good charging electronics - making them very efficient when you use them with solar chargers, for example.

And they can charge & discharge simultaneously.

The price is also pretty much right. Would very much recommend these.
>>
>>47177810
>$11

where to buy
>>
so if my phne is plugged into a charging bank can i charge the bank without unplugging the phone?
>>
>>47177810 (cont'd)
Also interesting: One of many teardowns:
http://www.gizmochina.com/2014/11/11/xiaomi-power-bank-16000-tear-down/

>>47177826
I bought them from various sources (quite a few relatives wanted one, too).

Merimobiles, antelife, ibuygou, geekbuying & aliexpress were where I bought them from, though there are many more shops... prices fluctuated and I kinda just found the cheapest price as a little pasttime.

The aliexpress one was unfortunately a fake, but that's of course just one store there...
>>
>>47177869
This does not work with every bank, but yes, with some you can.

With others either the phone or the bank won't charge.

I also had some in the past that got remarkably warm, though I did not know if that was "too" warm I simply didn't risk it anymore after I noticed.
>>
>>47177907 (cont'd)
Also, as an additional remark, charging efficiency & heat production & the current various banks can accept/deliver is really quite different.

I've had some very cheap banks which had like 60% charging/discharging efficiency, and it seemed to me like there also was a lot of loss on discharging, though I didn't remove the batteries to verify that hypothesis (would have known if I had charged the batteries separately, perhaps).

Most were like 70-80%.

The Xiaomis charge/discharge at like ~91% efficiency, which is really nice.

(Since I haven't bought any high-end packs after the Xiaomis, I don't know if others do that too... but anything I had bought at +- that price until then -which were four packs- doesn't.)
>>
I got one from argos a couple years back for when I went camping, got 2.5 charges out of it on my HTC one x, don't use it anymore, stopped smoking weed and now I don't have any friends, just the warm glow of my monitor to keep me company. Hold me /g/.
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>>47178338
thatescalatedquickly.jpg
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>>47175380
>>47175332
I'm with these guys. 12000mAh for emergencies. really helps if you crash at a friends house or are on vacation.
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>>47178375
I bought it exclusively for camping, who camps alone? Seemed relevant. Now it just sits there accumulating dust. As lonely as I.
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>>47178431
>$30
Same price gives you ~16000mAh on the Xiaomi bank 'cause they used better batteries.
>>
>>47178485
Camping sites are full of people looking for social meetings in the evening.

You can also shock your balls with the power pack and become a guru of e-stim fetishism ... it might also lead to something social.

Always glad to provide the best advice.
>>
/g/: how do these work? Do you just plug the unit into the wall to charge up, and hook everything else up (phone etc) by USB?

How long's the lifecycle on these things, and am I going to get good use from something wallet-sized
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>>47175677
>my 'interesting' life consists of using a phone enough to drain it within 40 hours
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>>47178595
> /g/: how do these work? Do you just plug the unit into the wall to charge up, and hook everything else up (phone etc) by USB?
Most of these both charge AND discharge by USB.

You could plug them into your computer (by means of an USB cable) to charge, though it's more common to use a household power socket -> USB power adapter... even more so if you want to charge the power bank at more than 500mA - most computers won't do that.

Usually household -> USB power adapters are an accessory, otherwise they're available cheaply online ($1 for crappy ones, ~$5-10 for really rather good ones).

> How long's the lifecycle on these things, and am I going to get good use from something wallet-sized
Most as long as the 18650 batteries inside, though some charge shitty and will reduce cycles a bit.

Let's just say like 1000 charges / discharges, though capacity will have gone below 80% of new at some point before that.

http://www.hardwarezone.com.sg/review-xiaomi-16000mah-mi-power-bank-review-get-it-if-you-need-charge-2-devices-fast
>>
>>47178609
>not making videos and taking photos of your adventures with the worlds most convenient camera
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>>47178431
Do your friends not have electricity?
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>>47178726
>using electricity you didn't pay for

Holy shit I bet you pirate software and media too, don't you? Fucking freeloader
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>>47176592
>Carrying around lead and acid
Nigga you crazy,
I can't see any benefits over a bunch of 1865s stuck together?

>tfw I saw a 230 volt AC powerbank in a store a few weeks ago
I kind of want one or more of those, and an alienware laptop to actually play vidya for 8 hours on a plane or something.

I can't really think of a GOOD reason for a 230v ac powerbank though...
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>>47178682
Woops, wrong linkage.

http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

Just FYI, wouldn't go to great lengths to preserve a battery pack though.
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>>47178726
>tfw charging my powerbank at friends house so I don't have to pay for my own electricity

I don't own a computer, just a smartphone (that I was given). All my computing is free.
>>
>>47178812
> I can't really think of a GOOD reason for a 230v ac powerbank though...
Autonomous solar/wind power, for example.

It's only "feeling" efficient enough with LiFePo4 or such, though, and almost no one does that yet.

The batteries exist anyways for big backup power arrays (until the diesels are running) or starting planes (not necessarily at 230V) or such. Other uses, eh.
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>>47178812
>play vidya for 8 hours on a plane or something.
Isn't a standard wall socket type of shit pretty common on planes these days?
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>Portable power banks
Plebs.

>Measuring everything in mAh
This is what happens when you have Americans who don't understand SI units.

Here's part of my 18360000 mAh "power bank."
>>
>>47178893
Storing wind energy is probably still cheaper with lead acid though, isn't it? If you're not living in an RV or something, the weight and size shouldn't matter.

Still don't see a reason for the existence of the product I was talking about.
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>>47175986
Did you dream it?
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>>47178973
nigga how the fuck else do you measure a batteries general capacity.
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>>47175109
Yes, I have one to power my cellphone jammer. It doubles the lulz on a long day.
>>
>>47177810
If this thing can provide enough power to run a raspberry pi, and two 2.5" hard drives for half an hour, I'm sold.

As long as it can be charged at the same time. Since I'm going for a ghetto UPS setup.
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>>47179049
In a unit that isn't counted in multiples of thousands of a unit that is one thousandth of a larger unit.
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>>47179056
>cellphone jammer
lol what.
>>
>>47179087
>this convoluted answer
Alright then.
>>
>>47179088
It blocks cell frequencies, causing causing calls to drop or prevent them all together. It's great fun in crowded places.
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>>47179145
That's got to be illegal. Where'd you get it?
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>>47178995
Hm, it's a tough call. First of all you have worse storage over life by battery (which almost makes up for the like 2x the cost).

Then you have extra losses at charging / discharging.

Then there are the disadvantages how rapidly you can charge / discharge. Maybe that means you need more batteries than you'd like for the capacity.

Then there is the problem with keeping the batteries inside so they can remain warm, flooded wet cells release too much gas to be safe. Sure, there are gelled electrolyte batteries, but these also cost more and narrow the voltage ranges at which it can be charged more...

It will depend on a lot of factors, but I'm just not at all sure it's always working out to be cheaper to use lead-acids,
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>>47179102
I'm mocking the fact that you're using 1/1000th of an amp hour to measure several amp hours. The milliamp hour is a subset of the amp-hour, not the other way around. Using mAh to measure capacities over 1 Ah is beyond stupid, especially since the precision of a battery absolutely doesn't warrant such precise denomination.
>>
>>47177880
>3200 mah cells
That's cool, I already thought there had to be something better than the 2200/2600 you see everywhere. Those prices are awesome too.
Are 'rectangle'/flat lithium batteries more expensive to make? Or just harder to keep cool and to keep from bending and puncturing compared to strong cilinders?
>>
>>47179182
It is. They used to sell them on DealExtreme. Bricks were shat when I had to go to the Post office to pick it up. My paranoid mind was convinced it was a sting or something.
>>
>>47179182
>That's got to be illegal.
Very illegal. Federal crime to block the airways.
Anything that could potentially block emergency calls/services are potentially major offenses.
>>
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>>47179232
I bet you think using pennies is also stupid, too?

What ever, bud.
>>
>>47179313
>how much is that soda?
>"one hundred and ninety nine pennies"
>>
I got some random enclosure from eBay that takes in 4 18650 batteries in parallel and then puts out 5V USB on 2 ports with a boost converter.
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>>47178338
> Those prices are awesome too.
Yea. And that's the reseller prices including export shipping fees and their cut.

The original price was cheaper... but ah well, we can't get that in Europe or the USA right now.

Maybe if they start selling here officially, but for now, it's a good price comparatively speaking. Xiaomi's product quality is really neat anyways...

> Are 'rectangle'/flat lithium batteries more expensive to make?
I'm not sure, but 18650's were cheapest to buy in retail for a while now... maybe there's a reason behind this. Might be economy of scale, might be manufacturing complications... not sure.
>>
>>47179379
PS: The biggest one is ~$21.6, medium is ~$13.4 smallest one is ~$9.3 in Malaysia and even like $1-2 less in China, retail pricing.

Always odd to see how in China, this stuff is even 1/3 cheaper after already being cheap on export.
>>
>>47179505
So something like this should be decent? Is ebay more trustworthy? I don't want to get screwed over.
>>
>>47179592
You can see in the pic that I need one, kek. Wifi tethered all day...
>>
>anker 2nd gen astro pro2

It's pretty good. 3 usb ports, 20k mAh, battery percentage display

http://www.amazon.com/20000mAh-Multi-Voltage-Portable-External-Camcorders/dp/B005NGLTZQ/ref=sr_1_1?s=electronics&ie=UTF8&qid=1395172313&sr=1-1&keywords=anker+astro+pro
>>
Anyone know of a power bank that I can configure to only charge for x number of hours after it's unplugged? Bonus points if it uses batteries that wont shit themselves in adverse thermal conditions.

Looknig for a convenient way to power my dash cam setup for a couple hours after I park, and I don't want to bother recording continuously.
>>
Which of these support rapid charging technology? Do any of them?
>>
>>47178696
Are you a teenage girl ?
>>
>>47179641
>wont shit themselves in adverse thermal conditions.
Do such batteries even exist. Fuck I bet their expensive.


It would probably be easier for you to jurry rig a timer switch that just disables power to to the unit after a certain time period.

Or just get a smaller power bank that can simultaneously charge and recharge at the same time. So when you turn your car off, it'll power your device till it dies, then when you turn your car back on, the power bank begins to charge, and then begins to power your device once more.
>>
>>47179592
It seems almost too cheap to be genuine, but if it is, then why not?

> Is ebay more trustworthy
Which store is this, anyways?

But not really. Many of the biggest rip-offs in terms of markups on asian product prices are also on eBay.

And while on eBay you can get your money back when you get a fake, you can also do that with Paypal or aliexpress or your credit card company.
>>
>>47179668
some of the anker ones do
>>47179683
now come on, don't be that much of an /r9k/ tier shut in that you think only teenage girls take photos
>>
>>47175109
if I did it would be this one
http://www.thinkgeek.com/product/ceca/
>>
Anker E4 13k mAh, I got it for $30 on amazon. planning on using it for ingress once it warms up and I start playing a bit more.
>>
>>47179641
>Anyone know of a power bank that I can configure to only charge for x number of hours after it's unplugged?
Eh? You mean after it's plugged? Or are you talking about discharging it?

Anyhow, I'd use an external timer for that, not anything on the battery pack.

Note that any halfway decent one doesn't overcharge either way.

> Bonus points if it uses batteries that wont shit themselves in adverse thermal conditions.
Which ones do?
>>
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Pic related
It's a beast.
>>
>>47179711
Good. Next phone I own will have that, and being able to put my phone on a power bank for like 20 minutes and getting 4 hours out of it or what ever will be nice.
>>
>>47179723
>thinkgeek overpriced shit
why?
>>
>>47179668
The Xiaomis do this quite well.

See the test that I posted accidentally in >>47178682, for example.
>>
>>47179904
Now to just find a place to buy one that wont scam me.

>16000mAh

seems kinda large, but its going in my purse, so that may not matter.
>>
>>47175332
It's great, I only wish it was matte instead of shiny
>>
>>47179710
Pic is aliexpress, I guess both ebay and aliexpress sellers do want to keep their ratings above 99.9% positive or something, so bitching about receiving a fake is probably going to work.
>>47179723
>wearing anything bigger than a terrorist watch
>handcuffing yourself to your device
>wrapping housefire batteries in a thin plastic enclosure around a weak part of your body that also happens to be able to smack against walls and doors a lot

And it doesn't charge my vita, and less than half my phone, for 25 burgers excluding shipping.
That money could buy you 10(!!) times the capacity, plus the ability to charge 3dpd grils' iPhones while charging your own phone too.
>>
>>47175293
Too bad Thinkpads only have a 2 hour battery life
>>
>>47179696
I was contemplating just getting a smaller one, but the problem is that most of the ones that are actually any good are 12k+ mWH. My cameras draw like 1.6 watts each at most. A 10k mWH literally would power both of them for more than 5 hours (the power usage is much lower when stationary, my guess is because the video encoding is a lot simpler)

As far as durable batteries, lead acid ones seem to work just fine for 5+ years in a car. A pitty I couldn't find anything like what I'm looking for that wasn't a several hundred watt system. I might just setup a direct draw system on the battery since my fuse box has several open slots, and configuring something that way is just a voltage limiter, and a microcontroller that checks the ignition, and whether the voltage on the battery is dangerously low (part of the appeal of the seperate pack is that it ONLY drains the battery when the car is running, so I'm guaranteed power for starting in the dead of winter)

I just don't want the battery to die after 6 months of hot cold cycling when I'm rolling around town in the midwest. Temperatures here can go from -40f in the winter to well over 100f in the summer if it's parked in the sun.

>>47179748
I'm talking about discharging. Engine cuts off. Power to the battery pack stops, it provides power for like 3 hours, then shuts off, regardless of how much power it has remaining. If the pack is not charged enough to run for 3 hours, it just shuts off whenever.

It's dash cams with capacitors. They cannot be overcharged. When the power feed goes out, the camera safely shuts down in about 5 seconds, writing whatever segment it was on to disc. The capacitors take notably less than 30 seconds to fully charge once they get power, and the camera starts up as soon as it gets power.
>>
>>47175986
that would be the tits for photojournalists/reporters

>>47176719
not that dude, but /diy/ acts like supar sekrut club assholes if you ever think about asking questions about anything, ever. like if you ask whats a good adhesive to bond 3M scotlite fabric to cordura that wont crack, they start babby dont know hurr durr. they are as bad as /out/

>>47177036
col mustard, in the parlour, with a wrench
>>
What would be a good semi-portable battery pack for a laptop? No car batteries.
>>
>>47179981
>Pic is aliexpress, I guess both ebay and aliexpress sellers do want to keep their ratings above 99.9% positive or something, so bitching about receiving a fake is probably going to work.
Not only that, eBay and aliexpress both will typically refund to the buyer's favour at the most minimal proof provided (some picture or whatever), but on Aliexpress you can't do that after you confirmed receipt, so have a close look first.

Which you should. Xiaomi fakes are usually superficially looking very comparable (especially when you don't expose the internals).
Which is also why there aren't too few aliexpress sellers that try selling Xiaomi fakes anyways.
>>
Anyone know any good replacements for the stock battery that comes with the S4, or basically any 2600 mah battery? Also the techmatte 12,000 powerbank is pretty decent. Customer support is pretty good as well, their cable that came with the thing shit itself and they're nice enough to send a replacement.
>>
>>47180043
A second one of the same battery that your laptop already has is the obvious choice.

You don't want a 230V external battery pack.
>>
>>47180111
> any good replacements for the stock battery that comes with the S4
They are like $5 on aliexpress or eBay.

I don't think there's anything significantly better that you can get than just a new battery when yours is showing signs of aging or defects.
>>
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>>47180191
thanks m80
>>
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>>47175109
I use a battery case for my phone, 3800mAh case because my phone dies at 40% and a new battery costs more.
It charges at 0.5A so the battery drains when the screen is still on but does the job.
>>
>>47180026
> Power to the battery pack stops, it provides power for like 3 hours, then shuts off, regardless of how much power it has remaining.
Hm. I think you might have to DIY that externally. At least I personally never saw a battery pack that would do this.

I'm certain that someone will eventually stick a programmable computer and half a smartphone into some battery pack, but it hasn't happened yet...

>>47180238
No problem.
>>
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I put together my own. You can buy the case and electronic board for around $10 then all you need is 4 18650 batteries. I settled for some Panasonic 3400mah batteries. It's got all kinds of safety features and the charge controller is pretty good too. I think it cost me around $50.
>>
>>47180325
>$50
for how many mah? seems like a waste of time and money, they're so cheap already
>>
>>47180325
I also did that with this one:
http://lygte-info.dk/review/Review%20USB%20battery%20box%204x18650%20Evertones%20ET-406%20UK.html

But since the Xiaomis are out, those are the cheaper option... even without your somewhat too expensive $50 option.
>>
>>47175271
Easy to find
>>
>>47180372
Do the math nigger. 3400mah*4 batteries.

>>47180387
That's a nice one. Arent those xiamos sealed? I don't like the idea of having a sealed battery pack that you can't know for sure the quality of the cells and you can replace them. It was actually $42. The 4 Panasonic batteries were $32 and the case was $10
>>
Hey /g/ I wanted to ask and this thread seems appropriate.
I was looking for a portable battery, pretty much for once a day use because I work 15 hour night shifts and my phone always needs a top up because I use it to listen to music and whatnot during pretty much the whole shift.

Pretty much the smaller and more portable the better,and along as I can get one full charge on my Nexus 5, which only has a 2300 Milliamp battery Im good. So anything like a small 2500mAh or up would be fine.
Looking at either the Anker Astro Mini or the PNY PowerPack Digital 2600 at the moment.
What do I get, or am I missing one thats even smaller or more convenient?
>>
>>47176592
>>47176612
does not belong on diy, fuck urself

you dont use transformers to convert DC to DC

2 standard choices are switched mode power converter (efficient) or linear (inefficient but better quality output)

I recommend linear for your specific application using an LM317
>>
>>47180423
>Do the math nigger. 3400mah*4 batteries.
it was rhetorical, I can do math, I was pointing out that it's a waste of dollar
>>
>>47180423
> Arent those xiamos sealed?
Yes, they are.

> I don't like the idea of having a sealed battery pack that you can't know for sure the quality of the cells and you can replace them.
Well, the earlier is kinda guaranteed by Xiaomi's quality control and the suppliers being LG (I think also had Panasonics).

But the latter is true. Now the question is if that makes it worth to pay $50 rather than ~$25-30 (for the common price for the 4 16000 one - not sure if the one anon found before on aliexpress for $22 is genuine yet).

The Xiaomi bank barely costs you more than the batteries inside are in online retail - at least the places I saw.
>>
Anker 12000mAh

Pretty good, but takes forever to charge, and you can't discharge whilst charging at the same time.
>>
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>>47176592
But a dc to dc converter faggot. Just go on eBay and look for one that accepts an input voltage of 5v to 40v and that has a variable output voltage. The current will be constant of 1 or 2 amps.

>>47180452
Show me a cheaper option that uses equal or higher quality cells and has the option to replace them after they can't maintain a charge anymore.
>>
>>47180578
PS: While Xiaomi is often faked quite skillfully - no, they don't produce fakes themselves, and they have a very low incidence rate of QC lapses, as far as I can tell.

They're the number 3 smartphone manufacturer worldwide now, and also pretty big in this battery business, IEM, various other devices... they don't fake shit, and their specs are accurate.
>>
>>47180433
Depends...
http://www.gpbatteries.com/INT/index.php?option=com_k2&view=item&id=173&Itemid=527
This looks pretty nice if you want something that doesn't look like a dick in your pocket, but you are probably going to pay a bit more for the thinness. You can shop around on aliexpress or something , but there is nothing 'perfect'. Just compare online forever, or overpay for something nice, don't overpay for a 2200/2600 mah battery though, they are generally slow and too expensive for what they offer (if you're not buying in china)
>>
How long do 'power banks' generally last while unused after being fully charged? - like if I were to charge one up fully, say a 20k mAh model, and sling it in a drawer
>>
>>47180433
You could use this:
https://www.fasttech.com/product/1137904-miller-ml-102-universal-usb-smart-charger-version

Review here: http://lygte-info.dk/review/Review%20Charger%20ML-102%20UK.html

Get a 3000mAh or so battery, there are voltage conversion losses and losses between discharging this and charging your other battery.

Xiaomi's 5200mAh might also be an option.
>>
>>47180578
I wonder what size batteries that one uses. The 3400mah 18650 from Panasonic are the best in that form factor at this moment. I saw a picture online and it looks like it's using 4 batteries but no one makes a 18650 that has a capacity larger than 3400mah. Maybe they are using a larger size battery. Because I can't see how they can claim 16000mah with what looks to me 4 18650 batteries.
>>
got a monoprice power bank for my mum for a trip she is taking, but forgot to check voltage or whatever, so the tablet she got can't be charged by the power bank.

gonna get a small anker one for myself when i have my free ebay bucks go through.
>>
>>47180679
http://en.wikipedia.org/wiki/Lithium-ion_battery#Self-discharge

Also see linkage in >>47178818 for more permanent capacity losses on full charge.
>>
>>47180679
They can last quite a while, but you shouldn't store a battery at 100% for a long period of time, it makes them degrade faster. That's why new phones etc are always 30-50% full. Not because they discharged from 100%, but because they are going to stay in a box for a month, but maybe even more than a year, so they only charge them to half their capacity or so.
>>
>>47180738
It's 5 3200's, 3 at the bottom, and 2 + pcb above that.
>>
>>47180738
The 16Ah pack has 5xLGABE11865.

Yea, 5 not 4 batteries like the mid-size battery pack that has 10,6Ah.

I just took the next bigger capacity from your setup.
>>
>>47180801
Pic from review.
>>
got a 3200 mAh anker mini for my nexus 5, adds a charge and a half

was cheap as fuck and does what it needs to
kinda wish it had an indication of the juice left but hey, it was $13
>>
I would have thought the next step up for these would be a SIM card slot. Insert a 4G sim, top up with a few shekels' worth of data and away you go
>>
>>47180798
>>47180801
>>47180816
Oh man that's nice. Looks like a great deal. Looks like you would be able to replace the batteries too with some work.
>>
Yes, a cheero Energy Plus because it's 12,000 mAh for only like 25 bucks and it's small enough (barely) to comfortably carry in your back pocket. It has 2 usb ports for charging devices and little indicator LEDs to show how charged it is. It also has a flashlight that I have never used, but hey, it's there. Highly recommended.
>>
>>47180858
Certainly is nice, yep.

I've not seen people posting mods / repairs on this one yet, but it stands to reason that it's quite possible, probably even with different batteries.
>>
>>47179068

It can, I run this and my phone in series.
>>
>>47181595
You've tried it with 2x 2.5" HDD on the 10.4Ah model?

Personally, I am not too sure if that would work, a bunch of drives I looked up seem to draw around 5V/1A

Only the 16Ah model has that dual step-up converter, dual port setup that would presumably give enough juice...
>>
>>47178973
How much current can they handle?
>>
>>47181595
>I run this and my phone in series
I doubt it.
>>
>>47175986
I got it cause in my job I need to share data with coworkers so having a central personal cloud device works wonders. Also I'm in hotels a lot, so making my own WiFi from an Ethernet plug instead of the crap WiFi (or extended good WiFi) works amazing.
>>
>>47179313
Welcome to British Columbia, bitch. We dumped the penny hard.
>>
>>47175332
>$30
that's not bad, how quickly can it charge devices?

Any of these turbocharge compatible for devices like nexus 6.
>>
>>47175986
>>47175648
this is interesting me. Having personal network storage with you everywhere would be nice shit.
>>
My GS4 mini has a 1900 mAh battery, and I found it frequently dropping to ~30%, dying every once in a while with only a days use.
I picked up a cheapo $5 power bank at Target.
It's only 2000 mAh, but it charges my phone very quickly, which I like.
>>
2 dollar power bank because reasons
>>
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>>47175109
I have one of these, someone got it for me. I have yet to see one of their "refueling" stations. Apparently I can just pop the old one into the machine and get a new one as often as I want.
>>
>>47179755
>Buying from batteriesplus
They are severely overpriced.
>>
just got this in the mail OnePlus Power Bank 10,000/mah
>>
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>>47176947
I have good ones
>>
>>47178973
Since when is Ah not SI?
>>
>>47179087
those cells are 170Ah?
Holy shit how much did they cost?
>>
>>47180595
If you bothered to read the thread you'd have seen that I found what I was looking for without having to call me a faggot.
You have issues man.
>>
Bought this one for $11. Saved my ass a few times when traveling. Nexus 5 battery life a shit.
>>
>>47183255
I thought the Power Bank was going to be released later. How did you get your hands on one?
>>
>>47178829
>tfw
>not israelian businessman
>>
>>47179056
I'd be careful with that, man.

http://www.cnet.com/news/man-put-cell-phone-jammer-in-car-to-stop-driver-calls-fcc-says/

You won't go to jail, but if they catch you, they will have ample reason to fine you heavily. The guy in the article used it while driving to cut down on the amount of retarded drivers on the phone on the road on his morning and evening commutes, but the justice department will see it as an obstruction preventing people whom need to use the phone during emergency cases, such as during a car accident or something.
>>
>>47182752
I thought you can charge at 5V / 2.1A with many of the better ones (Xiaomi, Anker, ...).

I don't recall any doing that weird 9V / 2A over USB. [You can get 9V x A with a DC plug, but not USB...]
>>
>>47185607
it was on sale last Tuesday.
>>
>eneloops are 2000mah each
>8*2000=16000mah
>2.5 amp max, enough for ever tablets

Why aren't there aa to battery bank converter with 8 slots?

Even better, one with dual sides and 32000mah total.
>>
>>47187159
> eneloops are 2000mah each
At 1.2V. Good lithium rechargeables 18650 (of course, these are bigger...) are typically 3000mAh or more at 3.7V or 4.2V.

2Ah * 1.2V = 8640 joules
3Ah * 3.7V = 39 960 joules

Also, the loss on charging lithium batteries and the speed at which you can charge / discharge them is different, but I guess that wouldn't matter quite as much when you have 8 slots and only want 5V/2.1A out of it...

>Why aren't there aa to battery bank converter with 8 slots?
I thought there are.
>>
>>47187243 (cont'd)
There are some reasons why you might use the NiMhs anyways, resistance to cold temperatures or smaller capacity storage (I don't think lithium rechargeables can be downsized well to AA or AAA size...).

In the usual case you probably don't want a battery pack for smartphones and tablets and the like to be made with NiMh though. It's just more power, cost and space-efficient to do with lithium rechargeables.
>>
Why is phone technology so good these days.
My phone has 3000mah while my laptop only has a tiny bit more at 3200mah, it's so fucking bullshit.
It's just crazy seeing these power banks with more than 10000mah.
>>
>>47187324
Look two posts back.

Your phone probably has 3000mAh at 3.7V.

Your laptop might have 3200mAh at 14.8V or so.

> It's just crazy seeing these power banks with more than 10000mah.
At 3.7V typically, yes.

But true, the 16000mAh (internal 3.7V) Xiaomi for example has even >10000mAh after conversion to 5V, for pretty cheap.

That *is* very nice progress in rechargeable batteries and battery packs.
>>
>>47187382 (cont'd)
To clarify, various phones also have 4.35V or whatever batteries, and laptop batteries could be closer to 12V than 14V, or something else.

It's just probably not a completely nonsensical situation where your phone has just as much energy stored as your laptop battery that maybe has multiple times the volume of the entire phone...
>>
>>47187382
I'm really doubtful that any of the batteries in this thread actually holds anywhere near what they're advertised to be. Chinese companies are dodgy as fuck when it comes to battery capacity, like the giant 10Ah Zerolemon battery for the Note 3 that only holds around 6700mAh at best.
Thread posts: 181
Thread images: 32


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