I recently invested an arm and leg in my first set of recharbable batteries since I was 8. Not much has changed. I got the "Energizer Rechargable" AA, AA and C size batteries along with a compact charger and the Energizer Family charger. So far, the AA are horrible. I use them in this very computer mouse and so far I'm on my second charge after 2 weeks. To compare that, I would get about 2 months on standard alkaline.
I'm not sure if I have a dud, Energizer is a dud brand or if I expect too much out of rechargable. I need to purchase more for more gadgets/toys, but I'm not too sold on the value at this point.
Has anyone had better luck with Energizer or can recommend a different brand (that I hope is compatible with my chargers)?