Good on ya dopey, for buying the longest-lasting affordable EV. Here's a couple of additional details and clarifications. No LEAF has EVer had any kind of a cooling system, including the current 62 kWH battery. I've dissected all of them. Even the claims of passive cooling are malarkey, as the pack is insulated by a plastic shield below, and there's no effort to circulate air around the steel box.
The i-MiEV battery lasts longer not just because it is air-conditioned and heated, but it uses the much more durable and less environmentally and socially damaging LiFePO4 chemistry, and Mitsubishi runs that battery conservatively, choosing voltage setpoints for longevity rather than squeezing in a few more km of claimed autonomy.
Lastly, there's a quality rebuild and capacity upgrade available now for i-MiEV batteries, and the LEAF isn't quite there yet on rebuild compatibility either, due to their multiple BMS and firmware versions. The https://www.ozelectricvehicles.com/upgrades
does rely on the more energy dense NCM chemistry in order to pack nearly 30 kwh into the original 16 kWh case, but those cells should last longer with the i-MiEV's active cooling.
Also, Mitsubishi did the right thing for USA customers and warranted the design deficiency in our onboard battery chargers for 10 years and 100,000 miles. Our other 2012 model is due to be returned from the dealer tomorrow with a brand new battery charger!