Welcome to RC Battery packs - Radio Control

If you are looking for rc battery packs then Lipo (lithium polymer) batteries currently offer the best power to weight ratio but they do require special charging. Nicad's (nickel metal cadmium) packs are rarely used these days due to the heavy weight, low power density and environmental issues on disposal. NiMh's are still used but are becoming less frequent (nickel metal hydride) because lipo batteries just have more power and less weight to them. NiMh packs are more green for the environment but lack the power density that lipo's or li-ion can provide.

There are voltage differences to be aware of as the lithium polymer packs run around 7.2V while the nimh and nicad packs are 4.8V. Some receivers and servers are ok with the higher voltage that the lipo packs provide but please check manufacturer specs. Keep this in mind when determing the application you are using your rc battery packs for.

Here is a typical lipo pack by Thunder Power with charging red rc outpout leads. 

Thunder Power LiPo Battery Pack

More radio cotnrol battery info and sales to come...