If you are having trouble with your NiCd or NiMH batteries, you should look at the LiFe batteries. I have a couple from Hobbico and their charger. These are awesome. I didnt charge it in a couple of months as this is currently my spare. When I put it on the charger, it was still full. Discharging insing a NiCd routine on another charger it gave 3200mah even after a couple of months of not being used. They are still safer than using LiPo batteries and can take a lot more abuse

Ameyam