You said "Battery weight is almost directly proportional to capacity", and that's clearly not the case, at least for certain types of batteries/brands, as demonstrated.
One thing is sure: a 17 Ah Kalkhoff battery does not weight "almost" 55% more than the 11 Ah version.
Looking at generic bottle batteries as well, the weight does not seem to be proportional to the capacity either...
One thing is sure: a 17 Ah Kalkhoff battery does not weight "almost" 55% more than the 11 Ah version.
Looking at generic bottle batteries as well, the weight does not seem to be proportional to the capacity either...