Catflyer wrote:Hi. My partner and I are looking at buying a Leaf and have been using LeafSpy Pro to check out second hand cars. We test drove a 2013 Leaf with 40k+ km (25k+ miles) on the odo and got the following Battery Status:
106 QCs & 3114 L1/L2s
min/avg/max=3.931, 3.936, 3.941 (10mv)
Temp C=8.6, 8.4, 8.7 (F=47.4, 47.1, 47.6)
All of the Cell Pairs except 1 were showing red and this was consistent for the 2km test trip we did.
This all seems a bit weird for a 3 year old car with 40k+ km on the clock? Any ideas on what is going on?
After the drive I noticed that I had the LeafSpy Pro set to 2011 Year. would this have effected any of the values returned by LeafSpy Pro? Also note that this is a ex Japan import (as are most of the Leafs on sale here in New Zealand).
The AHr, SOH, and Hx values are about what a new battery would have so I believe there are three possibilities:
1) The battery was just replaced and the car has not been driven more than a few kilometers.
2) Someone fraudulently reset the LBC (lithium battery controller also called the BMS or battery management system). If so, the AHr, SOH, and Hx numbers will drop rapidly as the car is used on a daily basis.
3) The car has way more charge cycles than one would expect for the number of kilometers it has been driven. The car may have only been driven very short distances and recharged so it has never been discharged enough for the LBC to determine the true battery capacity and condition. If so, the AHr, SOH, and Hx numbers will drop as the car is used and the battery is deeply discharged once in a while.
I doubt that having Leaf Spy set for 2011 would cause incorrect readings of AHr, SOH, and Hx values. It is normal to have many of the cell pairs showing red (shunts active for cell balancing) under certain conditions so that by itself is not a concern (my 2015 shows mostly red when I start driving after charging). To give you some numbers for comparison, here are the latest from my 2015 when parked last night with new values in parentheses: AHr=55.28 (64.38), SOH=89% (100%), Hx=83.37% (101.25%), odometer=25,590 miles (9 miles when initial Leaf Spy readings were taken on February 7, 2015), QC=23 (1), and L1/L2=432 (4). Battery temperatures when parked last night were 108.6 F, 106.7 F, and 104.9 F.