I just have a 60. In winter, I need daily charging to 90%, but in summer I can usually get away with 80%, but once in a while I cut it too close and I have to top up during the day, making we regret not doing my daily charge to 90%. This probably happens once every two weeks or so. So, am I really doing my battery a big favour by charging to 80 instead of 90 for 7 or 8 months of the year? Or is this not really a big deal? I do plan on keeping the car long term. Thanks!