ORIGINAL: j.duncker

I do not like dual battery systems. There is more to go wrong. Simplicate and add more lightness! Just pick the correct battery size to begin with and install a battery monitor if you are marginal or have doubts. I do this on my helis with digital servos because the current consumption is huge and variable depending on what kind of flying you are doing.

I would rather fast charge between flights than rely on seperate batteries. The model shops will advise 2 batt setups for obvious reasons.