You can estimate the health of the battery fairly well by doing a short-ish range test:
- Note the current state of charge (SOC) BEFORE you start driving
- Reset the energy economy gauge and trip counter BEFORE you start driving
- Drive on a highway, in good weather, maintaining 50 mph until the state of charge has dropped by 25% from the SOC you noted earlier
- Get off the highway ASAP and note how many miles you drove and the energy economy reading on the dash
With the above information, you can estimate the kWh capacity of the battery:
Step 1 - Calculate kWh consumed by trip:
distance (miles)/efficiency (miles/kWh) = usage (kWH)
Step 2 - Calculate approximate pack capacity:
Since the above is the kWh usage for 25% SOC drop, 100% estimate would be just 4 times that #
For example, if you drove 20 miles over a 25% SOC drop and average 4.5 miles/kWh, then:
20 miles / 4.5 miles/kWh = 4.44 kWh consumed for trip
Then, multiply that number by 4 (i.e. 17.7 kWh) to get the estimated pack capacity in kWh.
Note that none of the above relies on LeafSpy data, which is why it's useful...
A brand new pack is around 21 kWh useable, so LeafSpy SOH should be about 84% in the example. If instead it was >90% then a BMS reset would be a strong possibility.
Having stated all of the above, a BMS reset on a 2013 would be pretty obvious anyways because virtually no 2013s are likely to have an SOH >90% at this point.
However, a used 2015 that was driven in a hot climate and had its BMS unscrupulously reset then exported across states, would be more likely to fool a potential buyer. That's because most 2015s in moderate climates would still have >93% SOH.
That's the purpose of a range test - to weed out BMS reset LEAFs.
FYI, before you buy any LEAF, make sure you know its history and where it was first sold. I personally would never buy a LEAF that lived out most of its existence in a hot climate - unless it was dirt cheap and very likely to qualify for a free replacement pack.
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV