LiPo - 4s2p or is 4s 10000mah suffice?

[BrianG]

If two packs have the voltage and current requirements you need, it basically comes down to what will physically fit in whatever you plan to put it in. The 10Ah packs are longer and wider, but not as tall since there are only 4 cells instead of 8 in the 4s2p pack. Depending on how you mount the pack, the reduced height may help keep COG lower. And since the 10Ah pack is longer and wider, it may help to spread the weight to help prevent a "heavy spot".