I'd be surprised if each battery couldn't come with a little computer that tracks charge times, cycles and power output over time. It would make it trivial to m

I'd be surprised if each battery couldn't come with a little computer that tracks charge times, cycles and power output over time. It would make it trivial to monitor whether or not a battery is currently serviceable (or whether it will expire prematurely). For EV fleets we used to only be able to do this per vehicle (not by battery) while the vehicle was home and charging, by shipping the fleet battery metrics to a central aggregator. But that is overkill for consumer vehicles.