On Fri, 5 Apr 2019 00:58:45 -0700, Mike S wrote:

I was given an electric drill that uses 12V lithium ion batteries
because the charger didn't work and the batteries died and the owner
lost interest.

The photo is NOT a LiIon charger, which would include an IC to control
the voltage and current to the battery.

Perhaps it might be useful if you would disclose the maker and model
number of the drill and charger? The battery type could then be
easily researched.

It is possible to convert a NiCd or NiMH drill to operate from a LiIon
battery. Is this what the former owner has done? If so, you will
need a much better LiIon battery charger designed specifically to
charge a LiIon battery.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558