For what it is worth, here is my experience with the 2011 Leaf battery vs. 2015 Leaf battery in Phoenix.
2011: At 14 months of ownership I was down to 10 battery bars. I parked the car in my garage every day, which gets incredibly hot in the summer -- and retains the heat overnight. Nissan bought that car back from me but I was hooked by the EV bug and couldn't stand driving ICE.
So, in 2015 I bought a used 2011 Leaf with a month-old 2015 Lizard battery. During the hot months (May-October) I did not park my car in the garage during the day. Instead, I parked in front of my house, with no shade. But I figured the air temp cooled down quicker on the street than it did in my garage. I walk every morning at 4:30 am, so during those hot months I would move the car into my garage at 4:30 and let it charge until I left for work at 7. That system worked out great and was not inconvenient.
I am now in month 34 of ownership of the Lizard battery car and still show 11 bars. Although, I have been thinking for months that I will lose #11 any day. My full charge currently shows 222 gids. And the range is definitely more like 10 bars than 11.
I only fastcharged my 2011 twice (at the beginning and at the end of the Phoenix Leaf Range Test in 2012). My Lizard battery car doesn't have fastcharge ability.
Good luck with your car and enjoy it!
Hi Kelly, thanks for sharing your experience with your Leafs, much appreciated.
Sounds like that battery could handle our heat here a bit better than the older batteries so this info is encouraging to me.
Also was thinking while reading this, that being the Leaf unfortunately has a past negative battery-heat relationship, and most owners (plus the capacity is shown ok the dash unlike most other popular EV's) check their batteries with Leaf Spy etc and know more details than other EV owners do, who knows what's really going on with other EV battery degradation since no one delves into it as deep as Leaf owners do.
At least I've never read anyone testing a Miev, Fiat 500e etc battery, though likely some do and have; I just never see anything online regarding battery capacity as much as I see with the Leaf, the Leaf dominates this topic when Google searched.
Anyways thanks for your post and stay cool this week and the summer.