I use Rayovac "Hybrids" and some Energizer cells for my camera. The Rayovacs claim to not lose their charge much while stored, which works nicely for my camera, since I might not use it much for a week or two at a time. I've never had a problem running low on power in my camera, even after taking a few hundred pictures in a day, a week or three after charging the batteries. I use the Energizers most in my flash...
I use some really old, 1600mAh rechargeables in my mouse, and they last about two weeks, then I switch in some Energizers from my flash while the mouse batteries charge, then I go ahead and charge the Energizers, put them in my camera, and charge the Rayovacs. Then, I switch around the Rayovacs and the Energizers, and life goes on for a week or two. 🙂 I use alkalines in my keyboard, and I think in general, they last about a year, honestly. I absolutely love my old school Logitech keyboard and mouse! 🙂