My 2015 has done much better than either original or replacement battery in 2011. I am presently at 64183 miles with 10 capacity bars. The 2015 replacement batteries in 2011 and 2012 cars may not fare as well because their maximum charge rate is 3.3 kW on Level 2. I notice that Leaf Spy numbers drop if I drive gently and/or charge at lower rates and return to normal with freeway driving and 6 kW charging.
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