I'm very excited about this trial. V2G has been talked about a lot in the recent months, but my concern, and I'm far from alone, is what impact will fluctuating charge and discharging have on battery life and performance. Will people really be happy for an external operator, albeit with permission, and some payment, to charge and discharge their batteries if there is a potential negative outcome. Will battery life and performance be affected by daily use in this way? Or is there a mechanism to protect each battery from constant partial charge/discharging?  I'm looking forward to seeing more from this study.