Q:What is the story with the weight? If two batteries on the same capacity and cell number have different weight, does that mean that the heavier one has more Discharging capabilities (more C)?
A:About weight, usually the exact capacity cells will also have a certain weight of the inside materials. If just under with real materials and also under the same dimension, of course the weight (as the materials is more) is higher, then capacity is good and also the discharge capability is better. But not higher weighter much better. As the RC models sometimes needs lower weight under the same lipo packs. So this will need higher production technology to make it.