yeh -the cells are actually rated at 3.6 v apiece - in real world the .3 v is instantly skimmed off when you first use a freshly chaged pack 12x3.6=43.2 - but if anyone measures that pack - hooked up in the model - they won't see 43.2 it will be less.
Forget the "theory" --in actual practice I never see 3.6 except at end of fresh charge.
3.5 would give 42 volts n' there you go