New poster here (although I have followed site since inseption), so please be gentle. Lost a capacity bar on 8/3/12. Took it in for 1 year battery check up and told all O.K. (all 5 stars). Called Nissan (no-gas #) and was given a case # and told how to be more proactive about battery loss (very nice person but no idea about the fact how hot it gets in the Palm Springs area, hotter most days that Phoenix). I believe that Nissan has underestimated the impact of the temps on the batteries as do most of you. Info for wiki: vin#-6877, date of loss-8/3/12, mileage-9570, mfg date-6/11, purchase date-8/11, case #9137890, never quick charged or used L2-always L1 to 100%.
Decided to submit a complaint with NHTSA (no this isn't just a place for safety concerns, they also investigate defects in cars from power windows to heaters and such). I consider this issue to be a defect. If the cars in hot weather climates do not perform as well as the cars in other climates (and we were not told of this), that is a defect. As far as the comments of time left at high SOC, 100% vs 80% charge, QCs per week and all, Nissan has given me a report card (battery test) that shows 5 stars across the board. Their indications to me is that I am doing everything to spec and above (when I used to get all As in school, I usually passed the class). Complaint #10469729, submitted on 8/8/12, will be available to view in 72 hrs. I do think this a step everyone who has had capacity bar loss should take (https://www-odi.nhtsa.dot.gov/ivoq/index.cfm
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Also, submitted an inquiry to Consumer Reports on 8/8/12 with the same concerns. If this a car they are going to review, they should investigate it completely, and this is also a form I would suggest everyone fill out (http://custhelp.consumerreports.org/app/ask
" onclick="window.open(this.href);return false;). This can be a little confusing (in fourth line click on Non-Consumer Reports product or services, click again for Share an experience and then click again on Defective but non hazardous).