Are larger battery packs more efficient than smaller battery packs due to "resistance in parallel" rule, assuming eveything else being the same?
As an example let's consider two 48V battery packs - 13S2P and 13S6P (let's assume that individual 18650 cell can handle 30Amp power draw). And electric bicycle that has a motor that consumes 2.88KW at cruise speed.
2.88KW at 48V would imply need to draw 60 Amps.
I found on Internet that Panasonic 18650 cells have 0.05 Ohms inner resistance. So, for 13 cells in series that would be 0.65 Ohms resistance.
With 13S2P battery pack the 60 Amps would be distributed over two parallel branches. Hence 30 Amps per branch. The waste loss due to inner battery pack resistance over both branches summed together would be
With 13S6P battery pack the 60 Amps would be distributed over six parallel branches. Hence 10 Amps per branch. The waste loss due to inner resistance in battery pack over 6 branches summed together would be
Is there really 780W difference in battery pack waste heat? Does inner battery cell resistance stay constant over different current draws and temperatures?