Apologies if this is off-topic.
I was given a used standard cordless 12v drill and 2 batteries, without the battery charger. The drill didn't work at all with one battery, and just turned slowly for about 2 seconds with the other, so I assumed the batteries were flat and so ordered a new charger.
However, this didn't seem to work. Having got a replacement charger to eliminate that, I found it still doesn't work. I assume it's the drill that's the issue, but it could conceivably be the batteries.
What do I need to do to test the batteries and drill with a multimeter?