Check out rechargeable alkalines from Rayovac or other brands. Alkaline is the recommended type for most electronics and someone finally made a recharger for them a few years ago.
While I'm sure there are "better" batteries out there, the Panasonic set at Costco can't be beat:
8 x 2200mAh AA nimh batteries
2 x ?mAh AAA nimh batteries
Quick (90 min) charger
Car Power adapter
USB Power adapter
Cozy little pouch to carry it in
All for $24! :Q I've got it and it works great. Batteries last a long time, and charge quickly. They also sell an additional pack of batteries (8xAA, 4xAAA) for $13 or so.
Sanyo also makes great NiCAD batts, but of course they offer less capacity than their NiMH NiMH brands I really like are Powerex (Maha), Goldpeak, Lenmar, and made in Japan Energizer. I would recommend a charger that can condition the batteries while charging them like my Maha C401FS.
NiMH batteries would be fine for that application even though they do discharge at about 1% per day whether used or not. If you get 2000mAh or higher, I'm sure they will go a good while between charges (at least a couple of months). You'll save a good bit of money on the up-front cost with NiMH and the savings just keep mounting up with each recharge. The Energizer 2500mAh is the current top AA unit at least for digicams and other high drain loads. Heck, my RF keyboard goes months and months on just a pair of good brand alkalines like Energizer Max or Rayovac Maximum Plus - it has just a 65mA draw.
. Batteries are designed for certain types of loads - Li and NiMH are good for heavy drain devices. NiCads would be good for keyboards but they are environmental persona non grata. So either use NiMh and have to charge 'em about every other month or Alkalines for about year and throw 'em away.
.bh.
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