Questions and Data tracking

[canspark]

Beginning and current data points from a BC, Canada 2016 Spark EV purchased July 2019 (distances converted from kilometres)

2019-08-01 : 16.63 kWh: 19709 miles/31720 km
2020-02-17 : 15.7 kWh : 24570 miles/39543 km

= 0.93 kWh/7823 km or 4861 miles

I calculated 1 kWh/5257 miles.

Charged almost always with level 1, a handful of level 2, and a couple of DC level 3.

If this rate continues it looks like the Spark will be about 10.9 kWh in 2024. I think this will be less than the warranty?

[Kermit]

It's hard to tell if the battery degradation is linear or if it will lose less capacity with age. I have not been keeping track of it for more than a year so I can't tell if that is true or not.

Your degradation per miles/km may be skewed because your data points were taken at different times of year.
If you notice my capacity went up from May through October then it got colder and it began dropping.
I think checking the capacity degradation would be best comparing year to year (i.e. February to February) to get a more accurate decrease per mile/km.

If you continue to post your data we can all track it together to get a better picture of how fast the cars battery loses capacity.

[canspark]

Thanks Kermit.
Here’s my full set - Aug 1, 2019 is the kilometres driving home from the dealer. Data is via an ODB Bluetooth adapter + EngineLink iOS

2019-08-01 31720 16.63
2019-09-03 33100 16.57
2019-09-14 33568 16.53
2019-09-26 34016 16.43
2019-11-12 34689 16.4
2019-11-25 35012 16.33
2019-12-04 36900 16.07
2019-12-30 37800 15.93
2020-02-01 38933 15.73
2020-02-17 39543 15.7

[RSC]

March readings:

Date.......... Miles. Capacity (kWh)
05/5/2019 18601 16.1
06/1/2019 18905 15.9
07/3/2019 19259 15.9
08/1/2019 19669 16.3
09/1/2019 19878 16.4
10/2/2019 20190 16.0
11/1/2019 20611 16.0
12/3/2019 20974 15.7
01/1/2020 21176 15.7
02/1/2020 21460 15.4
03/1/2020 21692 15.2

Still dropping, even though it seemed like a warm February.

[Kermit]

Date - Odometer - kWh - Full charge range
02/14/19 12464 16.33000 81
03/01/19 12700 16.26670 98
04/23/19 13316 16.20000 108
05/21/19 13692 16.03333 107
06/17/19 14008 16.03333 96
07/12/19 14291 16.29999 93
08/13/19 14827 16.56666 92
09/12/19 15279 16.56666 99
10/09/19 15771 16.73333 108
11/15/19 16293 16.36666 88* (After full preconditioning cycle)
12/09/19 16485 16.20000 97
01/08/20 16905 16.03000 92
02/09/20 17314 15.80000 86
03/04/20 17647 15.80000 96

This shows a -0.47kWh capacity loss over 4,947 miles when comparing March to March.

[RSC]

April readings:

Date.......... Miles. Capacity (kWh)
05/5/2019 18601 16.1
06/1/2019 18905 15.9
07/3/2019 19259 15.9
08/1/2019 19669 16.3
09/1/2019 19878 16.4
10/2/2019 20190 16.0
11/1/2019 20611 16.0
12/3/2019 20974 15.7
01/1/2020 21176 15.7
02/1/2020 21460 15.4
03/1/2020 21692 15.2
04/1/2020 21951 15.2

Not many miles last month, what with social distancing.

[Kermit]

Date - Odometer - kWh - Full charge range
02/14/19 12464 16.33000 81
03/01/19 12700 16.26670 98
04/23/19 13316 16.20000 108
05/21/19 13692 16.03333 107
06/17/19 14008 16.03333 96
07/12/19 14291 16.29999 93
08/13/19 14827 16.56666 92
09/12/19 15279 16.56666 99
10/09/19 15771 16.73333 108
11/15/19 16293 16.36666 88* (After full preconditioning cycle)
12/09/19 16485 16.20000 97
01/08/20 16905 16.03000 92
02/09/20 17314 15.80000 86
03/04/20 17647 15.80000 96

This shows a -0.47kWh capacity loss over 4,947 miles when comparing March to March.

I am not going to charge this month. I have been working from home and the state of charge is between 50-60% and I want to keep it there until I am commuting again. I did check the capacity and it said 15.53% but it has not been fully charge since the 3/04/20 charge.

[MrDRMorgan]

Date - Odometer - kWh - Full charge range
02/14/19 12464 16.33000 81
03/01/19 12700 16.26670 98
04/23/19 13316 16.20000 108
05/21/19 13692 16.03333 107
06/17/19 14008 16.03333 96
07/12/19 14291 16.29999 93
08/13/19 14827 16.56666 92
09/12/19 15279 16.56666 99
10/09/19 15771 16.73333 108
11/15/19 16293 16.36666 88* (After full preconditioning cycle)
12/09/19 16485 16.20000 97
01/08/20 16905 16.03000 92
02/09/20 17314 15.80000 86
03/04/20 17647 15.80000 96

This shows a -0.47kWh capacity loss over 4,947 miles when comparing March to March.

I am not going to charge this month. I have been working from home and the state of charge is between 50-60% and I want to keep it there until I am commuting again. I did check the capacity and it said 15.53% but it has not been fully charge since the 3/04/20 charge.

This is very consistent with the degradation I am seeing on my 2016 - it dropped 1.0 kWh in 10,624 miles.

[Kermit]

It was interesting to see the capacity dropped even though it was not charged to 100%. We shall see what it does as it warms up.

[MrDRMorgan]

It was interesting to see the capacity dropped even though it was not charged to 100%. We shall see what it does as it warms up.

I usually see a 0.3 to 0.4 kWh rise as we go into summer and, as we head for winter, it drops again and goes lower. The linear trendline on my graph projects I will be at 11.4 kWh when I have 60k miles on the ODO. I currently have 30k on my 2016 and my battery capacity is 14.5 kWh. I estimate my battery capacity will continue to drop to 14 kWh at 35k miles, 13 kWh at 45k miles, 12 kWh at 55k miles and 11 kWh at 65k miles. If I drop below 11.4 kWh before August 2024, I will be visiting the dealer to discuss a HV battery warranty claim.