Lithium Polymer

>>>/diy/

The fuse is kind of a problem. Try and find a scrapped battery backed UPS, they have a pair of 80A fuses. You'll need 4 in parallel.

>>60344023
>20S
that's a lot of voltage

>>60344023
>220A
you would need a 1 metre^2 steel rod to carry that type of current

>>60344162
74V volt nominal voltage, 84V fully charged.

>>60344186
Kek

I only have 220A for 10 seconds, after that the controller reduces to 150A.

>>60344023
>How harmfull is it to overcharge the battery?
it explodes probably
>Wich charging voltage is ideal for longest battery life?
80% and also don't drop below 40% voltage during usage assuming you want max life expectancy

>>60344162
Well you need volts for torque

>>60344287
>volts for torque
Actualy higher volts mean higher rpm while higher current means higher torque...
>>60344271
>80%
How many volts/cell would that be?
>40%
How many volts/cell would that be?

>>60344320
per cell

4.20v = 100%
4.03v = 76%
3.86v = 52%
3.83v = 42%
3.79v = 30%
3.70v = 11%

>>60344334
Thank you, so charging up to 4,05V/cell and discharging to 3,8V/cell.
Or 76-81V

>>60344376
>3,36V/cell
That is way too low.
Anything below 3,3V/cell is killing a LiPo cell...

>>60344207
12V car audio fuses, easy to get, doof-doof heads get through them like toilet paper.

>>60344352
yes

>>60344352
When you balance it will be 4.2 V per cell.
Discharging to 3.7V before recharging will keep your batteries from puffing. I wouldn't discharge them below 3.7V. Some do, I wouldn't. And if you're spending enough for 20S then I definitely wouldn't.

High Voltage would be more efficient as you wouldn't need to draw as much current for a given power output. Just make sure the motor's kv and gearing are appropriate of course!

>>60344449
My ballancer has a 4,1V/cell setting as well.
I already have the parts, and a voltage higher than 74V would be harder to handle.
Rewinding the motor is not an option for me.
Also the motor won´t see more than 20-30A for extended periods of time anyway.
I also intend on storing it in the fridge when not using it.

File: 1.jpg (230KB, 678x617px) Image search: [Google]

230KB, 678x617px

>>60344449
i guess they don't take puffing into account in this depth of discharge graph then

>>60344511
Careful that 4.1V setting may be for a different variety of lithium battery. 4.2 is for LiPo batteries (like the one pictured for like RC planes and shit)

Current is gonna be determined by the battery's C rating. In this case go as high as you can afford especially if you want good "punch"

>>60344607
The current can´t be a issue while charging a 10,2Ah pack with a RC-charger.
When it ballances every cell to 4,1V the process shuoldn´t harm the battery.
>the one on the picture
I used these to build that pack.
It is rated for 20C peak, so it is enough for 208A/10s and 150A/60s.