TobyYarwood wrote:Can someone please tell me why these two leafspy screenshots are so different?
The first is too good to be believable for a car with near 40,000 miles. The second would be very very good, for a car with 40,000 miles.
The BMS takes time to re-adjust to a more accurate value. That is what I think you are seeing as the report is now more accurate.
LeafSpy reads out the BMS's estimates of capacity. I've learned some ways that these estimates can be changed by driving/charging differently.
It is also possible to reset these estimates to factory new levels. This can be required to be done as part of some repairs/ firmware updates.
A brand new Leaf, zero miles, wouldn't read out as high as the first. While it is possible that under normal driving a better than average pack might get as high as the first Leafspy screen shot (67 AH, etc), at a 1000 miles or so, it will not be that good at near 40,000 miles. As far as I've seen, about the best would be to get near 100,000 miles before loss of 15% and the first bar. So I'd expect about 6% down at minimum at 40,000 miles. The second screenshot is doing slightly better than that. Now maybe a UK leaf battery is better than the US version, and maybe your weather is cooler than the coastal Pacific Northwest USA... I can't have a strong opinion on how accurate the second screenshot is.
To anyone buying a Leaf, if the Leafspy report is too good to be believed, don't believe it. It might not be intentional decept, but then again it might. Proving this would be challanging, at best.
Best bet would be to take a Leaf with known and accurately measured battery condition, and document what Leafspy shows before delivery to the dealer, and sell it to this dealer. Then see how it looks when the dealer shows a Leafspy report to a prospective purchaser. I'm not sure if this would be illegal...Or just embarrassing.