Avoid if you can, don't worry about it if needed.BillAinCT said:
The more important lesson is to not leave the car sitting at full charge, and this is all the more true when the battery is at high temperature -- e.g., in the summer, or after DC fast charging.
Newbies look for good/bad dichotomies but it doesn't really work that way. Battery temperature, SoC, and duration are the main variables and they exist on a sliding scale where less is better. Battery degradation is fastest when each variable is on the high side and they co-exist at the same time.
From our 2013 LEAF: our 24 kWh battery has about 17 - 18 kWh usable. When my wife plans to take longer drives she charges up to 100% SoC and the car can sit for hours before it is used. In the winter I'm not happy about the behavior but I don't worry about it too much. If it happened in the summer I would have a small temper tantrum. Day after day would be a reason to hide another information session.
LEAF care, advanced
An interesting puzzle occurs in the winter because charging a cold battery is another degradation pathway known as 'Li plating.' I choose to charge the car immediately after a drive in the winter when the battery is warm, as opposed to in the early morning in the summer. My behavior has the undesirable side-effect in the winter of leaving the LEAF to stew at a higher SoC since the car will usually only be used the next day. My gen LEAF lets us choose 80% SoC so I'm less concerned about the extra time it sits at that SoC. It would be a much harder choice if the car was charged up to 100% SoC every day**.
**
If faced with a LEAF that only charged to 100%, I would reprogram my EVSE to a lower amperage in the winter so that charging completed closer to when the car was used and the cold battery would not have to take high-er amps.
