I was sent here from this >>56120712 post.
I wish to crack open my laptop battery and replace the worn out cells with NCR18650Bs because I doubt I can find a replacement battery with them in it. What techniques are involved with splitting open the battery in a reusable way?
Fixed post;
>>>/g/56120712
>>1039804
If you take your time you should be able to pry the top and bottom open with a small screwdriver or a knife. Search google and you'll find some videos of people doing this.
>>1039804
Do you have a dremmel?
>>1039849
Yes
>>1039804
Do some research first. Search on the make/model of laptop battery and see what it takes to work properly with the charge controller.
Many battery packs incorporate a small microcontroller to monitor and control cell charge state and temperature. Some of these will 'lock out' if a cell voltage drops to zero. Which could indicate a dead cell that could explode. It also drops to zero if you remove a cell from the pack. Resetting some of these is a non-trivial task. And if not reset, the pack is unusable.
>>1040572
>Resetting some of these is a non-trivial task. And if not reset, the pack is unusable.
as in 'there's a physical fuse that blows and those fuses are not available to the general public'
I have to buy sketchy copies from Alibaba.
>>1040846
What if you cut the traces going to the fuse before removing the cells?
>>1039811
A lamented card to crack the glue and plastic guitar pick to pry and pop locks can be less damaging than metal tools, smart phone plastic pry bars can be handy as well but are less likely to be sitting around at home
Hey
I have tried that excact thing.
It is not easy. Swapping the batteries and such, is not a problem. But the Charge controller in the battery will most likely not accept an increase in capacity. But that depends on the controller.
The battery I took apart was from an MSI laptop. The Charge controller was from Texas Instruments. They come with a lot of smart functions, like a joule counter, temperature sensor, current sensor and charge/discharge protection.
They brand them as Batterygauges, fuel-gauges or some funny shit.
Can't remember the IC name, but something with BQ in the beginning.
Programming these bastards is not trivial, as they have tiny legs to solder wires onto. They also brick easily while programming.
I wouldn't attempt this again, I rather by a new battery..
>>1040846
>as in 'there's a physical fuse that blows
No. More like: The battery controller reset/initialization procedure is not obvious and may in fact be proprietary.