padamson1 wrote: Herm wrote:
This morning my 100% charge read 264 gids or 94%
My WAG is that the accuracy of the GID counter is 5%, so perhaps you only had 1% degradation, or you sneezed while less than 10ft from the the Leaf
My understanding is that a timed 100% charge will not perform cell balancing, only a manual override 100% and leaving it plugged for a couple of extra hours will get the balancing done. However just doing one manual 100% charge is not enough because the LEAF's top-balancing involves bleeding higher voltage cells until all cells are within a small difference, which means the battery is not really at 100% after a cell balance and an additional charge will be required. Thus most recommend doing two or three successive 100% charges, the first being a manual timer override to perform the cell balance and depleting the battery at least 10% in between the charges, to get the actual peak GID number.
So even taking into consideration the GID error measurement percentage, there is a source of error for a lower GID reading. No guarantee, but from other postings on this subject I'll bet that you pick up enough GIDs to raise your percentage if you follow the recommended practice.
I live in coastal Orange County, Southern California. Just some comparison data from my LEAF:
Delivery date: March 30, 2011
Manufacture date: 2/11
EDIT: My usual Gid count at 100% up until early May, 2012 was 281 Gids.
Usual Charge %: 100% first 13 months, 80% for the past 5 months
Battery capacity bars: still 12 bars
Driving range from full charge to turtle on July 7, 2012 at 4.0 mi/kWh indicated on dash: 75 miles. This is 87% of the full range at a similar driving economy when the car was new of 86.5 miles.
My 80% charge Gids most recently were in the range of 206 to 204 this past week (about 88% of new battery 231 Gids).
I charged to 100% each night for the past four nights. I used an end timer for the first of these four charges, and a start timer only for the remaining three charges. The Gid readings after the four charges were 243, 240, 247 and 246 (about 88% of new battery 281 Gids).
You can draw your own conclusions, but it looks like successive 100% charges without an end timer might contribute to a more complete full charge.
I agree that I'd rather have zero battery degradation, and when I took delivery of the car, I didn't expect to see any loss for the better part of the first three years. Now that I've read a lot more about lithium batteries, it's clear that capacity loss comes with the territory, though to a varying degree depending on chemistry, temperature management, depth of charge and discharge and many other factors. I think that Nissan should have prepared us better for early capacity loss by making it clear during the initial publicity and buyer screening that we should expect measurable range reduction within the first 18 months. I'm glad I leased, and that decision was carefully made with the expectations that new technology carries with it many unknowns and that the first generations of most new technology are rapidly succeeded by better versions, often at lower prices.
That said, my average daily driving is 30 to 40 miles, and even at 80% charge, I can drive 60 miles. So it looks like the LEAF will be able to fulfill our driving needs through the end of our 39 month lease. Nissan claims that capacity loss is greatest at the beginning of the battery's life and then it levels off. The Arizona loss data looks more linear than that. I'm very curious as to whether we'll see lessening of the rate of Gid loss as the temperatures drop this fall, and even an increase in Gid capacity.