Per Stormin Mormon:
The good quality D size NiMH cells tempt me
to purchase. But, I don't use that much
equipment that has D cells. And, so far,
alkalines do the job.

My marine GPS uses AA NiMH cells and I find that the self-discharge rate
on them is quite high - high enough that I need to charge the batteries
the night before each use.
--
Pete Cresswell