I have observed this with my new 2012 LEAF. With battery at "full" charge when at moderate temps, it would hold 278-280 Gids (I have never actually seen 281, but other drivers did on my car).turbo2ltr wrote:
I haven't looked at his data, but as far as I'm concerned, any increase as it got cooler wasn't a "seasonal winter increase" it was a "recovery from a summer decrease".
All I know:
Hot temperatures reduces the ability of the battery to store a charge.
My car did NOT charge to 280 for the first couple months. I am quite sure I remember others reporting this as well.
I'll leave the speculation up to you.
When the battery became hot, at over 130F, it would only hold about 255-260 Gid. Once the temp returned to "normal" that same day, it would hold 278-280 Gid again.