Battery degradation

[bsd]

I have a S85 from Sep 2013 with 39200km. At 90% I get 376km rated and 435km ideal.

 

[wolfpet]

Thanks everyone! I realize that the data is limited, but I feel it's sufficient to start drawing some charts. It's also consistent with the data I have seen from our global community. Here's what we have so far:

 

[beeeerock]

Are you allowing for the different ratings associated with individual models? P85 vs. S85 vs. 85D etc...

 

[wolfpet]

Are you allowing for the different ratings associated with individual models? P85 vs. S85 vs. 85D etc...

Not really, but I have a feeling that the rating difference (if it really exist) would be within the noise range.

 

[Doug_G]

That is consistent with Tom Saxton's more comprehensive data. The only things that seem to matter is pack size and distanced traveled (a proxy for pack charge cycles, which is what really matters).

 

[hingisfan]

I just have a 60, and today I rolled into the SC with 10km left (about 2kw), and I added 54kw in my charge session. 56kw useable seems pretty good to me. Rated only went up to 317km, but didn't move until I had already gone 6km. I have 31k on the odometer.

 

[Roddy]

S85 from May 2013 with 60,000KM. Charged 90% today and got 367KM rated.

 

[PoweredByRain]

Earlier I said it charged to 425 km at 100%. I just did a 11,000 km trip... it now says 423 km at 100%. Charging to 90% it says 377. Odometer 48,000 km.

 

[mnx]

I seem to be on the low end of the curve, although I probably have one of the higher Wh/km as well. (ie. more charge cycles per km driven) Fwiw Mine is a P85 from February 2013.

54,806km - 224Wh/km - 356km rated at 90% (this dropped from 361km in the past month. I left it set at 50% and plugged in while I was away from home for a week)

 

[mknox]

I seem to be on the low end of the curve, although I probably have one of the higher Wh/km as well. (ie. more charge cycles per km driven) Fwiw Mine is a P85 from February 2013.

54,806km - 224Wh/km - 356km rated at 90% (this dropped from 361km in the past month. I left it set at 50% and plugged in while I was away from home for a week)

Still better than my 349 km @ 90% (approx 88,500 km on the clock)

 

[mrElbe]

23,611 km and 362 km @ 90%. Used to be 368 km @ 90% when new in the winter.

 

[RAM_Eh]

I seem to be on the low end of the curve, although I probably have one of the higher Wh/km as well. (ie. more charge cycles per km driven) Fwiw Mine is a P85 from February 2013.

54,806km - 224Wh/km - 356km rated at 90% (this dropped from 361km in the past month. I left it set at 50% and plugged in while I was away from home for a week)

My car has 54000... km also but purchased in December 13. As stated below I have 362 @ 90%. May be the age too.

 

[LazMan]

Just another data point: My car is early 2013, 68 000km. 90% is 364km. I lost about 20 km in the first year but really haven't lost anything for at least a year. I charge to 100% only once or twice per year.

 

[clea]

mine has 50K kms purchased March '13 ... I still have 372 rated kms @90%. that's if i check immediately after charging ends. It can leach kms pretty quickly tho so if i leave later than usual in the morning it will drop to something like 368 rated km by 11h.

ps I charged to 100% for a trip to Ottawa on the weekend and i got 412 rated km

 

[wolfpet]

Thanks everyone for the additional data points! As your odometer reading goes up please feel free to post again. Every bit of data counts. Here's the updated graph:

 

[swrving]

9000km on the clock, P85D, originally 368 rated km at 90%, now down to 366 rated km at 90%. I noticed both times I went away for 2 weeks and the car sat plugged in, I lost 1 km of rated charge. Might just be a coincidence, next time I go away for a week I'm not going to plug it in and see what happens. I realize that my results will not be causal or conclusive.

 

[wayner]

9000km on the clock, P85D, originally 368 rated km at 90%, now down to 366 rated km at 90%.

What's the margins of error on this measurement? I am guessing that it is at least 2km so there is not necessarily a difference between those two readings.

 

[hiroshiy]

Thanks everyone for the additional data points! As your odometer reading goes up please feel free to post again. Every bit of data counts. Here's the updated graph:

Hi, I wonder if you used my data (I can see one lowest data on the graph). If so please update 346km with 369km, as my car is JP spec and the Rated range is different. 346 JP rated = 346 x 320 / 300 = 369 US rated.

In my case (same as EU):
@100% 385km or 410km/256miles in US Rated
@90% 346km or 369km/230miles in US Rated
After 24000km

 

[wolfpet]

please update 346km with 369km, as my car is JP spec and the Rated range is different. 3

Thanks! Here we go:

 

[RDoc]

As the cars get older the batteries will probably start showing time based aging more. It might be useful to do something like color code the data points by age, just bands of 2-3 years or so is likely enough to be meaningful.