Please use this thread to discuss the meaning of data obtained
from the LEAF Battery app, and comparisons with data obtained
from other devices or sources (like direct measurements).
I have a CAP of only 92.93% and I think this is quite disappointing considering that:jclemens wrote:I have 30,000km (18600mi) on a Nov 2011 Leaf and Cap is 97.3%
Is that good? I dunno. I was hoping for 98+
Probably not the app, but our LEAFs, IMO.="RuneW"... is there a chance that the app is calculating something wrong? ...
Or maybe not.garygid
...For lower battery pack Temperatures, like the 10 degrees C that
you show, there is possibly some reduction in effective capacity,
just because of the lower temperature, or lower temperature
cycles in the car's recent history.
If so, then the nominal capacity might only appear after operating at
nominal temperatures...
I'm 99% sure that the Ah reading is temperature compensated in some way as we know that GIDs are - reading lower in hotter temperatures and higher in colder temperatures.JPWhite wrote:I noticed I had lost quite a bit of battery capacity in short order. I found it was Thursday (May 16th) and did an analysis of what was going on to cause the 0.3 reduction in Ah in a single day.
I would want longer follow-up when the battery had cooled to 5 bars to be certain the loss is permanent. However, doesn't look too good. How did you get your battery to 90 degrees? QC? Parking on hot blacktop? What was the ambient temp?JPWhite wrote:I noticed I had lost quite a bit of battery capacity in short order. I found it was Thursday (May 16th) and did an analysis of what was going on to cause the 0.3 reduction in Ah in a single day.
As one might predict based on what happened (and is happening) in Arizona, high battery temp is the culprit.
Here's a graph of battery temp and Ah of the battery on Thursday this week. My battery got to 90F.![]()
Battery Ah never recovered overnight after cooling.
Daily degradation appears to be .02 or .03 Ah. So once battery temp gets above 86 or so, the degradation accelerates by one order of magnitude !!