Both charge and discharge rate affect battery degradation. I've heard varying information on this (and I'm sure it's also chemistry dependent), but a .2 C charging rate (about 12 kW for the Bolt EV) seems to be the ideal. Anything more or less actually has a slightly increased impact on battery life. As for discharge rates, I'd have to find the spec sheets for the Bolt EV's cells, but I believe they are rated for a 5 C discharge rate (about 300 kW for the Bolt EV). The closer you get to that, yes, the greater the impact on battery life. In the case of the Bolt EV, though, GM has restricted the battery output to 160 kW (about 2.7 C discharge), so it's really hard to discharge the battery fast enough to significantly increase degradation.Eric, does discharge rate have any effect on degradation?