[Zuman]

I have three Bosch 12v tool batteries that won't take a charge. I've watched a bunch of YouTube videos about jump-starting L-ion batteries with a good battery, but that hasn't worked for mine. I've also tried the "rapidly-switching-the-charger-power-on-and-off" approach that supposedly works with NiCads, but no joy there, either.
There was one interesting video about opening the battery case to gain access to the cells and then pressing a release button on the positive end of each cell to reset the cell, but opening the cases is easier said than done (the ones I need to revive don't have the three slots in the base or visible screws).
Has anyone had any success reviving lithium ion batteries for power tools?

[BobM]

You will probbably get a far better answer posting this question on a forum for carpenters, gardeners, people who work with those tools all the time.

[WGH]

Usually dead is dead. I buy a replacement battery and move on with my life.

You can ask at Masters of Finish Trim Carpentry on Facebook and then settle in for some well deserved abuse.
https://www.facebook.com/groups/257296515202295

[FullRangeMan]

Power tools needs alot of amperage from the battery.

[S Clark]

Usually dead is dead. I buy a replacement battery and move on with my life.
[/quoteI

And I've found that buying off brand batteries that are cheaper... is not money well spent.  Buy a name replacement or just put your money toward better tools.  I'm gradually replacing my Ryobi with Milwaukee at every birthday and Christmas.