On Friday, April 5, 2019 at 7:21:02 PM UTC-4, Mike S wrote:
On 4/5/2019 9:16 AM, Jeff Liebermann wrote:
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.

Thanks to everyone who replied.

I screwed up assuming it was Lithium Ion, it is not.

Black & Decker FSB12 FireStorm 12-Volt 1.2-Amp Hour NiCad Battery

I was about to say... I don't do much electrical work any more, but an electric drill battery that is lithium ?
I've never heard that.
(then again, I'm just not in the business right now - just my 2 cents)