Battery SoH for Potential Purchase

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brucekav

New member
Joined
Nov 1, 2024
Messages
1
Location
UK
Here's a Leafspy screen shot from a leaf I'm considering buying. It's 3 years old with 15,000 miles, 40kWhr battery. Is this battery SoH of 92% typical for this age and miles. 186 Quick charges seems very high for the miles if I'm interpreting that QC figure correctly. Adding together the quick and slow charges it's an average of 34 miles per charge. What about the cell voltage difference of 15mV. Is that reasonable? Thanks in advance. All new to this EV world.Screenshot_20241101_141323_LeafSpy Pro.jpg
 
It looks pretty normal to me, I think the battery will pretty much degrade close to 5% in the first year even if you hold your tongue just so. Somehow the mileage and the number of charges doesn’t make sense to me since the car seems to have averaged 200 miles for each charge, seems a bit high for a 40 kWh LEAF.
 
Thinking about this while driving to town my math is wonky, it works out to 20 miles per charge which also seems unusual. Wonder if it is a car used for short errands and then fully charged after returning.
 
The charge counter on Leafspy, just records contactor closing. so you get two for each timer charge and on for each immediate charge.
It has no relation to how discharged the battery was when connected to AC power. So could just be plugged in a lot.
 
Here's a Leafspy screen shot from a leaf I'm considering buying. It's 3 years old with 15,000 miles, 40kWhr battery. Is this battery SoH of 92% typical for this age and miles. 186 Quick charges seems very high for the miles if I'm interpreting that QC figure correctly. Adding together the quick and slow charges it's an average of 34 miles per charge. What about the cell voltage difference of 15mV. Is that reasonable? Thanks in advance. All new to this EV world.
Everything looks fine to me too, but it shows that the previous owners was charging to 100% a lot since those are way more than necessary to drive only 9.8K miles. The SoH is actually lower than I would expect given the low amount of miles, so again, I don't think the battery has been abused, but the previous owner had to be sitting at 100% a lot. The Leaf doesn't have a convenient way to manage the top end of charging, so you have to do the mental math yourself when to disconnect if you want to keep the SoC below 80% most of the time. Charging to 100% isn't an issue if you plan on using it shortly afterwards, but I think the previous owner probably had it sitting at 100% for days at a time between uses, like over the weekends for example while working during the weekdays.
 
What shows that? Not doubting you but I don't understand how you can tell that?
Mainly, I take the cue from the number of QC sessions. With 9,866 miles, doing 186 would average out to about 53 miles per QC session. I would suspect that they are not doing this many QC sessions because they think it's fun to QC for 12 minutes and then go drive around until they need to do that again an hour later. My guess is the QC is needed for a high SoC so that they don't have to go looking for a charging hookup elsewhere, away from home for example. With (259) L1/L2 charging sessions, the mileage is just too low to be plugging in that many times if someone was driving the Leaf enough to deplete the battery. I take the cue from what I've seen of other friends and family who always have their Leaf sitting at 100% SoC and it looks very similar to this. They either have the need to for a high SoC all the time or they still treat the Leaf like a Gas vehicle where 100% charge is like a full gas tank to them. 😏

The alternative is that the previous owner likes to do a bunch of "short" charging sessions maybe? With so few miles, that means either a bunch of 10 minute QC sessions or a bunch of L1/L2 charging sessions that only last an hour before they interrupt it. Unless they are driving withe Leaf with a parachute behind it to drag the efficiency down to 1 m/kWh, the number of charging session is way overkill, unless one uses that many sessions to keep the Leaf at 100% a lot.

That's just a theory, a Leaf theory... 😉
 
Ah, ok. I have a lot of L1/L2 on mine, because 1) the Leaf records each timer charge as 2 charges, and 2) if by chance I have to unplug the cord before the timer starts for some reason (real small garage in my case) it adds another charge when I plug it back in. 3) our use is such that while during the summer it might make 2 trips to town, in the cooler months it couldn't and wife has enough range anxiety already.
So mine gets a 2 hr charge a night at low current (most often 16 amps/240 volts). It doesn't sit at full charge and in most cases it isn't charged all the way up.
In the case above. it sounds like the owner had serious range anxiety problems, much more that the car did.
I have never QC mine and it only has 10 QC on it, I suspect at the dealer. In my case I don't live near enough QCers to venture that far, and then be able to make the next one if the 1st is out of order.
 
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