> a doubling of watts per kg Do you mean watts (power or rate of conversion) or watt hours (total energy stored)? I'm not positive but I believe you said it co

> a doubling of watts per kg Do you mean watts (power or rate of conversion) or watt hours (total energy stored)? I'm not positive but I believe you said it correctly, which is to say that the NiMh batteries don't store more energy than their NiCd predecessors. They can only discharge it faster (can push a higher wattage but still has the same total energy capacity).