does battery degradation plateau, or is it more straight-line, or what is the shape of the curve?

[syswei]

I have a 70D with 2k miles on it in about 6 weeks. It was getting 211 miles range (at 90%) but is now down to 208. Losing 3 miles isn't a concern, but if degradation continues at anywhere near this rate, I'm definitely concerned about how things will look at 40k or 80k miles.

 

[Max*]

[at 90% SOC] My 70D started at 214-218, within a few weeks I was around 212-214, then shortly after down to 208-210, and it stabilized at 208. A year later (25k miles driven in that year), I'm still at 208.

 

[TampaRich]

At 10K miles I'm hitting 212-214 on a regular basis with my 70D, 52 mile commute, charging every third day. I wanna say that I started at 220 when I took delivery 9 months ago.

 

[TexasEV]

Degradation is more in the first year and then slows down to about 1% per year. My 3 year old 60 starred at 208 and is now at 200.

 

[jaguar36]

Best source for data on this is the Plug in America survey.

 

[Rifleman]

Degradation is more in the first year and then slows down to about 1% per year. My 3 year old 60 starred at 208 and is now at 200.

You are doing better than my 2014 S60. I am at 187 @ 100%. My wife's 2013 S60 is still at 198 @ 100%. Both of us are around 40k miles.

 

[Petra]

I picked up my 70D about nine months ago and, at the time, my 100% showed 238 rated miles and 90% was 215 rated miles. 9k miles later and my 90% is still between 213 and 215 miles and 100% still comes up to 238 miles.

 

[ran349]

I have a 70D with 2k miles on it in about 6 weeks. It was getting 211 miles range (at 90%) but is now down to 208. Losing 3 miles isn't a concern, but if degradation continues at anywhere near this rate, I'm definitely concerned about how things will look at 40k or 80k miles.

I have a 14 month old 70D with 20k miles and my 90% is around 205. Most of the drop came very early on and for the last 6 months it has barely changed. Hopefully, you will see the same leveling off.

 

[Vince Cobelo]

Just want to compliment the OP on a good question. I have been wondering the same but haven't been able to quite articulate how to ask the question.

 

[Morristhecat]

I can only speak of my experience, but I found in the 1st 3 months there was quite a bit of degradation in my S60. If I recall correctly I think I started out with about 324km at 100%. After about 3 months it went down to 320km. Now after 3.5 years I can still achieve 320km as long as I balance the pack out about 2 times prior to a 100% charge. I find I only need 100% very rarely though, and I regularly charge to 80% most of the time. I think that the key for long battery life is to only charge to 80%, keep it above 25% on a regular basis. 90% is fine too, as recommended by Tesla, I just side on safety.

 

[Matteo]

Hi,

This is how the curve looks like. You can add your data to the same survey HERE.

 

[syswei]

Thanks, everyone. I didn't expect to see an actually line, as Matteo kindly posted, when I asked the original question!