[Piotrsko]

Hmmm: Imho with a volt pack, storage capacity is difficult to determine quickly, need a couple of runs at various drains and recharges. You need accurate aero data for that unless you know motor specifics. You can look at system voltages after some use but that doesn't show individual cell condition voltages which is related to capacity. Couple of borderline capacity cells can be covered by a couple of efficient cells of higher than standard voltage. You could find out after a high discharge rate unless you have some method for reading and flagging individual cells realtime. some homebuilder BMS will do that on the can bus.

I cant see a dealer letting me play with a pack on the lot. Or even letting me plug in test equipment to the obd system.