If the car is left plugged in for many hours after charging ends, that can drain the 12 volt battery, and THAT can result in bizarre errors and error messages. More on charging: think of the charging cable or station as a smart wall outlet. It checks for ground faults and an unreliable power supply,...

Leave it to them to fail to distinguish between "chargers" (sic) and "fast chargers."

Welcome. You don't have to worry about a damaging overcharge - the car will only accept as much charge as it takes to reach 100%, plus a little more to equalize the battery if needed. It isn't recommended that you leave a Leaf sitting at 100% in hot weather, or leave it that way for weeks, but that'...

Most Leafs will behave as Gerry and Learjet have described, but there are a few that chronically undercharge their 12 volt batteries. That is why I suggested an external battery maintainer. If an outlet is available, then I still suggest that. If not, then follow the above advice.

He meant that if you treat the battery in a way that encourages degradation, you may well "win" a new battery under warranty. More likely now, Nissan would, if you qualify for a new battery, buy the car back, instead. What encourages degradation? Frequent fast charges (when the battery is ...

EVs have no "starter" as such, but they do have big contactors that have to be closed with power from the 12 volt battery to "start" the car.

It's not you. It may be spammers who think that they can get the spam in later (they can't) or maybe it is AIs...

Welcome. If you are leaving the car plugged in after charging is done, for hours at a time, and frequently, that is killing the 12 volt battery. It's poor designing, but it's a known issue.

I think he was confusing the inverter/PDM/motor coolant loop with the battery.

$6k is reasonable for a 2011 with a good-not-great battery and that odometer reading, especially if it's cosmetically nice. $5k might be closer if the car has dings and upholstery damage. This is all subject to things like EV popularity and availability in your area.