i was walking around while i saw the guy in computer repair shop throwing away laptop batteries in his trash
i asked him
he said he don't need them anymore so i took them home with me and started to think
How to make something useful out of this batteries
actually each battery have about 3 ~ 6 cells 3.7v Li-ion
this is real treasure but no one knows
so in this instructable we should know how to recycle old damaged laptop batteries.
Step 1: The Laptop Battery
Be careful !! li-ion is dangrous don't short cells ot throw them into fire.
when i say damaged laptop battery i don't mean it's exploded or burned
damaged laptop battery is a battery that unable to recharge or laptop can't feel it anymore or even laptop said replace battery
when we see dead laptop battery there's 3 cases
the battery board is damaged and can't provide power for turn on the laptop
there is 1 or more cells not working properly so the whole battery is damaged and can't be use to power any laptop
the connection between cells maybe cut and circuit is not closed any more
the first thing is tearing down that battery to salvage cells from inside
then measure each cell it should be higher than 3v
try to charge each cell and monitor it until it reach 4.2v with special li-ion charger
then try discharge and see if it can last long time.
in next step we are ready with some cells
if you can't find laptop battery you can always find cells in electronics stores or online
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Step 2: Making the Power Bank
Follow the instructions in this video to know how to make your own power bank
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