I disagree--my 2015 is doing much better than either the original or replacement battery in my 2011. Today marks 27 months, 39,578 miles, with 11 capacity bars remaining right now and with Leaf Spy numbers:
"Gids" at full charge this morning=243
I was at 8 capacity bars and patiently waiting for a new battery from Nissan at 27 months and about 30,000 miles on the 2011. The replacement battery was only 15 months old with about 20,000 miles on it at the time of the crash and had been at 11 capacity bars for a while.
I have no desire for the complexity and power consumption of TMS.
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015