When I was using a Leaf to commute 5 days a week I used a smart plug to cut off charging when it would be ~70% charged, but only on Fridays. On Sunday I had the smart plug turning back on to get the battery to 100% and I let it charge to 100% on Mon-Thurs. My idea was to not leave in at 100% over the weekend but to have a full charge by the time I needed to drive to work. I was doing a 72km return trip and most of that was 100kph, so in winter I didn't have a huge amount left from my 24kWh battery when I got home. I doubt that the battery would have suffered much from being at 100% for a few hours, probably a lesser factor in battery deterioration than calendar aging or simply running the battery through a bunch of charge cycles. I bought the car when it was 2 years old and used it for 5 years and it still had >70% SoH on the battery and still was making the 72km trip just fine.