The issue with rechargeable batteries has been fixed (there have been a few threads on this recently). You need some of the new Low Self Discharge batteries, brands are Sanyo Eneloop, RayOVac Hybrid, etc. These do not have the self discharge issue that previous rechargeables have had. You can charge them in any NiMH charger though some chargers are better than others, if your charger charges too fast, or charges in pairs then replae it with something better.