At 70,000 miles and 3 years + 4 months of ownership, my battery seems to be in pretty solid shape, or at least what I would expect at this point. My previous posts have included scatterplots with trend lines, but I've found them to be less useful than direct measurements I get from full charges and from an OBDII scanner (+EVScanner app).
I fully charged my car (from 0% to 100%) last night. The charging session used 84 kWh. Adjusting for losses (typically between 9%-10%* when charging from empty to full), the energy delivered was 76 kWh, which puts me at 6.5% degradation (assuming an original capacity of 81.3 kWh).
* typical Level 2 losses are 5%-5.5%, but there is a lot of charging 'overhead' to bring the cells to 100%, so losses jump up to nearly 10% when deep charging from near zero to full.
This is pretty consistent with my EVScanner data (see image), which shows my readings straddling the fleet average curve of battery health. 93% (7% degradation) is expected at this mileage, and that seems to be where I'm at. I also use Recurrent (Recurrent » Driving EV Trust and Value with Real-world Data) to track my car data and battery health, and that shows a score of 92 (which implies 92% state of health), although I'm not exactly sure how it arrives at that value. In any case, these three measurements (full charge analysis, EVScanner, and Recurrent) all give a pretty consistent and confident answer regarding degradation.
Other key statistics from EVScanner (useful for some of you who geek out about the data):
![Image]()
![Image]()
I fully charged my car (from 0% to 100%) last night. The charging session used 84 kWh. Adjusting for losses (typically between 9%-10%* when charging from empty to full), the energy delivered was 76 kWh, which puts me at 6.5% degradation (assuming an original capacity of 81.3 kWh).
* typical Level 2 losses are 5%-5.5%, but there is a lot of charging 'overhead' to bring the cells to 100%, so losses jump up to nearly 10% when deep charging from near zero to full.
This is pretty consistent with my EVScanner data (see image), which shows my readings straddling the fleet average curve of battery health. 93% (7% degradation) is expected at this mileage, and that seems to be where I'm at. I also use Recurrent (Recurrent » Driving EV Trust and Value with Real-world Data) to track my car data and battery health, and that shows a score of 92 (which implies 92% state of health), although I'm not exactly sure how it arrives at that value. In any case, these three measurements (full charge analysis, EVScanner, and Recurrent) all give a pretty consistent and confident answer regarding degradation.
Other key statistics from EVScanner (useful for some of you who geek out about the data):
- Total charges: 1,134
- Full charges: 39 (3% of all charges)
- Full charge cycles: 289
