NiMH batteries don't hold a charge for long.
Especially high capacity ones.

Not so. I've put AA NiMH cells in a flash, that were charged months earlier,
and they powered it well. This is an urban legend that has little basis in
fact.


Temperature-charge termination is a BAD way to charge cells.

If it's the only method of termination, yes. But it's necessary to prevent
overcharging, especially when the manufacturer recommends "slamming" the
cell.