I think we are going to learn a lot about the cycle capabilities of car batteries in the next few years. Overall, battery degradation has been much less of a pr

I think we are going to learn a lot about the cycle capabilities of car batteries in the next few years. Overall, battery degradation has been much less of a problem in real world EV statistics, at least for actively temperature managed batteries, than many pessimistic models feared. One thing we seem to have growing evidence for is that battery cells resting at full charge for long periods of time may have more of an impact on battery lifetime than cycle counts, and so partial cycles of an active vehicle-to-grid system may actually be a smart plan for extending the expected life of EV batteries, given that evidence. Such systems are still in very early testing/planning, so we'll see as we learn. The fact that it is a possibility, though, greatly changes a lot of the "doomsday predictions" about electricity demand in an all EV tomorrow, so it is worth pointing out as a possibility, even if we aren't certain it is a probability that it will be used widespread.