I have a DeWalt Li ion 3ah battery that I have dropped twice, and now distrust. There are no visible signs of damage, but to be safe I have it in the garden shed, away from house and garage.
Where should I send it to have it checked out?
you cant get it checked, what happens is that the lithium tends to "spider" out and reach the opposite electrode, short out and ignite. this is the main reason that lithium polymer was invented as to stop the shorting out.
there are some pretty good infos on youtube,
probably with someone you dont like
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