Conventional Batteries

Until recently I had Sanyo NiCd (nickel cadmium) KR-1700AU cells in my heli. For the starter pack I have Sanyo RC-2400 cells (I have used Panasonic 2000 cells but they broke down after two years). There is no good documentation on the Sanyo site, but there are very good, thorough manuals from Panasonic , about physical cell structure, chemical components and reactions, (dis)charge characteristics, another manual about charge methods and a third about precautions.

In my transmitter I use 1400mAh NiMH (nickel metal hydride) batteries. They have been there since I started flying four years ago, and still seem okay. Because transmitter batteries (a) draw only little power and (b) are almost never discharged fully it is better to use NiMH in a transmitter instead of NiCd. For the receiver pack, the same holds in theory, but the higher internal resistance of NiMH makes it less suited for high currents that may occasionally occur in the receiver servos.
As above, excellent documentation is available on the Panasonic website, concerning physical cell structure, chemical components and reactions, (dis)charge characteristics, precautions, charge methods and packaging.