My 2012 lost bar number 3 with 22,000 miles on it....now I am keeping it outside in the hot Las Vegas sun, and letting it go as low as I can before charging. When I drive I am flooring it for bursts and letting it regenerate to heat it up. I called Henderson Nissan to do its yearly battery check and they do not have a certified leaf mechanic on staff...so I had to go to the other side of town and they were clueless on what to do. Their person looked at the battery and noted it as 9 bars.....I have until 12-17-2017...... Hopefully I will lose another bar before then. Any tips to further degregate it sooner?