diodes are a solid state component that will only let electron current flow go one way(ie: power only flows out not in, like a check valve) primary example is a wheatstone bridge design used for basic conversion of ac to dc. that being said the one thing your forgeting is that dc power in parrelle is additive and that while you are correct that there would be a slight" charging effect" on the smaller battery the cumlative mah is therfore greater and that "charging" effect is actually the combined battery pack way of achiving ballance. I will however agree that diodes are a fantastic way of isolatiog each battery pack from each other and limiting the negative effects should a cell go wrong on one of the packs. I however feel they are too impractical and also feel that the less juction points you have between the power supply and the motor the better.
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