Battery longevity study

[SoccerMan94043]

This is new to me and interesting... please delete if this has already been posted.

https://www.geotab.com/blog/ev-battery-health/

• Average degradation rate: The average annual electric vehicle degradation rate is 2.3%.
• Power: High-power DC fast charging (>100kW) is the single largest stressor, leading to degradation rates up to twice that of the low power charging group (3.0% vs 1.5% per year).
• Climate: Hot climates impose a penalty on battery life, with vehicles operating in hot conditions degrading 0.4% faster per year than those in mild climates.
• Utilization: The increase in degradation from high daily use is a measurable but worthwhile trade-off for the gains in fleet productivity and ROI.
• State of charge (SOC): For most EV use, there's no need to worry about avoiding fully charging or emptying the battery. Degradation only speeds up when vehicles spend over 80% of their total time at or near-full or nearly empty charge levels.

I have a 7 year old Tesla Model 3 with about 37K miles on it. While I haven't had it officially tested, it's lost about 20% capacity based on my current charging numbers.

• It's been in S.F. Bay Area it's whole life (moderate temps).
• It's only been DC charged maybe 4 or 5 times during those 7 years but charged often on a 30 AMP home charger setup (about 22 miles per hour, so slow).
• It's only been charged to 100% maybe 7 times and always for long trips so driven quickly. It's spent most of it's life time at or below 80%.

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[ovonrein]

So ... if I may take all of this at face value, your careful curation of your Model 3 over the years of ownership appears to have spared you nothing from the expected degradation in the stats before. Ergo, I might as well charge the crap out of my battery

 

[SoccerMan94043]

So ... if I may take all of this at face value, your careful curation of your Model 3 over the years of ownership appears to have spared you nothing from the expected degradation in the stats before. Ergo, I might as well charge the crap out of my battery

Yeah... not sure I will do anything different with my Taycan cause that process just works for me, but maybe nothing really matters and we're all doomed.

 

[CrazyINP]

That is great to hear and worse for me as well as mine is 99% charged using L2 charger. I rarely use DC, actually during my ownership I did it once just from pure curiosity rather than I need it to. I can charge at work and home, rarely taking it on long distance drive as usually our X5 is more comfortable with 2 kids and the luggage that comes with them. As long as the battery doesn't have defect haha. finger crossed!

 

[SoccerMan94043]

Was just thinking about this a little more. I've floored it from a stop, every chance I get and I usually average 2.6/2.7 miles / kWh

That could have something to due with an increase battery degradation. Also could be that the Tesla software reports my range lower than average.

 

[Tpup]

Very interesting, thanks for posting. I have a 21, coming up on 5 years old and I'm at 89% SoC.

 

[Taycan4S_UK]

mine is a MY21 and Porsche said it was 92%-93% - gave me a print out. top up to 100% at least once a month but typically 85%

 

[B61]

For the first three years, I’ve never charged on DC. SoH went down to 91%.
During 4th year, i was charging 4-6 times a month and I lost another 3%.

 

[SoccerMan94043]

This is new to me and interesting... please delete if this has already been posted.

https://www.geotab.com/blog/ev-battery-health/

• Average degradation rate: The average annual electric vehicle degradation rate is 2.3%.
• Power: High-power DC fast charging (>100kW) is the single largest stressor, leading to degradation rates up to twice that of the low power charging group (3.0% vs 1.5% per year).
• Climate: Hot climates impose a penalty on battery life, with vehicles operating in hot conditions degrading 0.4% faster per year than those in mild climates.
• Utilization: The increase in degradation from high daily use is a measurable but worthwhile trade-off for the gains in fleet productivity and ROI.
• State of charge (SOC): For most EV use, there's no need to worry about avoiding fully charging or emptying the battery. Degradation only speeds up when vehicles spend over 80% of their total time at or near-full or nearly empty charge levels.

I have a 7 year old Tesla Model 3 with about 37K miles on it. While I haven't had it officially tested, it's lost about 20% capacity based on my current charging numbers.

• It's been in S.F. Bay Area it's whole life (moderate temps).
• It's only been DC charged maybe 4 or 5 times during those 7 years but charged often on a 30 AMP home charger setup (about 22 miles per hour, so slow).
• It's only been charged to 100% maybe 7 times and always for long trips so driven quickly. It's spent most of it's life time at or below 80%.

Follow up to this story on my Tesla. I finally ran the official battery check which is now part of every Tesla initiated through the PCM. It came back with 87% which is pretty darn good for 7.5 year old car (only 40K miles though).

Not sure how accurate that test is, but at least it ran the battery to 0% and charged to 100% to figure it out.

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