This is very unfortunate. You seem to have treated your car very well and not stressed the battery at all. What are the night/early morning temps in Tucson? I live in a somewhat similar climate area in the SF Bay area (East Bay) where we experience high day time temps but cool nights. My charging is done with an end timer at 0700 in the morning. So my charging usually takes place in the wee hours of the morning. I have certainly stressed the battery more than you have - 55 to 60 mile round trip commute and speeds up to 55mph, 60mph on downhills. I try to limit myself to 20kW output for most of my driving. I have charged to 100% once to thrice a month, never QC. Yesterday I got 5.6 miles on my 10th bar (80% charge). The car has around 17,500 miles on it with all 12 bars intact. I think you have a defective battery since your climate is not that different from mine and you have taken better care of your battery than even I have. That too with only 6771 miles! Hope Nissan takes care of this issue.
DesertDenizen wrote:I don’t wanna to be in this club!
I lost my first capacity bar today. Only 6,771 miles. Manufactured 6/21/2011, took ownership 7/25/2011. I charge to 80%, never did a QC and charged to 100% exactly three times. The 100% charges were done just before I drove so the car spent no time sitting with a full charge. Never drove below 2 SOC bars. Received all 5 stars at my first annual, which was on 7/25/2012. I only charge every other day or so. I start to charge at 6 in the morning and usually leave around 9 so my Leaf doesn’t even spend much time at 80% charge. My Leaf has spent 90-95% of its time between 3 and 8 SOC bars. My long term average is 5.7 m/kwh and I drive on the frontage roads, not the highway, so I never exceed 45 mph. Exclusively in Eco. It is parked under a carport. I am out in the desert so there is no blacktop or concrete, just dirt. Tucson averages about 6 degrees cooler than Phoenix. Summer temp bars are usually 6, I have driven (but not charged) with 7 temp bars for short durations, but not many times. My new case # is 9497015.