Hi Joe -

For many years I got by with a LM317 configured for constant current -
1 amp usually - fed by a 13.6V bench supply.

I monitored voltage across the cell/battery, and called it good at 1.6V/cell.
Or plugged the bench supply into a mechanical timer, which shut off at a
guesstimated somewhat-less-than full charge, plus Kentucky windage for
ambient temperature...

I'm sure you can do better than that, but I have some nearly 15-year old
Sanyo NiMH 1600 maH AAs which still retain 900-1000 maH capacity.

These guys mostly keep small portable computers alive - A kinder, gentler
environment than running a drill, I imagine...
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