....eneloop?

Eneloops are Sanyo's brand of rechargeable Ni-MH batteries.

I just pulled my small boat flashlight out of the toolbox, where it has
been sitting for more than a year. Flashlight seems as bright as ever,
even with that amount of storage.

The four AA batteries in my camera flash have been recharged 93 times so
far. So far, so good. The newest eneloops are said to be good for 1500
charges.

The AA size eneloop is about $2.00 each.