[Mister Dave]

Bjørn Nyland: Battery degradation after 35k km (video)

Battery degradation after 35k km (new battery)

I received a new battery at 116k km. Now, about 35k km later, I measured the degradation to be 3 %. I also show you how you should do it and that if you measure the incorrect way, you will only get 1 % degradation.

 

[scottf200]

5% is typically in the first couple years then it tapers off quite a bit. Many long term owners and articles on all this.

The data clearly shows that for the first 50,000 miles (100,000 km), most Tesla battery packs will lose about 5% of their capacity, but after the 50,000-mile mark, the capacity levels off and it looks like it could be difficult to make a pack degrade by another 5%.

The trend line actually suggests that the average battery pack could go another 150,000 miles (200,000 miles total) before coming close to 90% capacity.

Via: https://electrek.co/2016/11/01/tesla-battery-degradation/

 

[scottf200]

I'm using www.TeslaFI.com to monitor all aspect of my X. It automatically gathers data and gives you 3 ways to look at the degradation. You can 'check' box the one that you want to graph. All the raw data used is in a table below this UI too.

 

[DonC]

All batteries degrade. No surprise that the Panasonic cells do the same. I've been surprised at how little these cells have degraded. I expected a larger drop in the first couple of years. That said, I've noticed that Tesla fanboys always have stats that suggest virtually no degradation, which is of course fanciful. We see something similar from Volt owners, just not as extreme. It's why double blind studies give you better information than not -- people get the results they want.

 

[scottf200]

... We see something similar from Volt owners, just not as extreme. ...

You've got to be kidding me. Most all Volt owners and the common suggestion on this site is the Volt batteries never degrade!! This is repeated regularly or a little less now that GM has fixes out to deal with what they call 'normal wear'. Wow, I can't believe the denial we see here called 'not as extreme'. It is over the top. Just because it is hidden for as long as possible does not mean it doesn't exist.

 

[hellsop]

You've got to be kidding me. Most all Volt owners and the common suggestion on this site is the Volt batteries never degrade!! This is repeated regularly or a little less now that GM has fixes out to deal with what they call 'normal wear'. Wow, I can't believe the denial we see here called 'not as extreme'. It is over the top. Just because it is hidden for as long as possible does not mean it doesn't exist.

Maybe I wasn't paying that much attention, but mostly I've only seen that nobody had seen any degradation, not that WOULD NEVER happen.

 

[scottf200]

Maybe I wasn't paying that much attention, but mostly I've only seen that nobody had seen any degradation, not that WOULD NEVER happen.

So these cars have been out for 7 years and people here are still saying and implying that the Volt batteries are not degrading BECAUSE it is not obvious. Many certainly say and believe that means they are not degrading because they don't see it. Until GM started changing limits where errors kick out (or reduced propulsion illogical msgs showed up) and GM documented 'normal wear' no one thought they degraded. Technically absurd.

When people try to measure the battery using phone apps or by watching the kWh's in and out then there is a whole lot of defense of these are only estimates or it is seasonal.

 

[obermd]

You've got to be kidding me. Most all Volt owners and the common suggestion on this site is the Volt batteries never degrade!! This is repeated regularly or a little less now that GM has fixes out to deal with what they call 'normal wear'. Wow, I can't believe the denial we see here called 'not as extreme'. It is over the top. Just because it is hidden for as long as possible does not mean it doesn't exist.

According to GM, the Gen 2 Volt's batteries won't show degradation for 6,000 full charge/discharge cycles (16+ years). But this isn't due to the batteries so much as the battery management GM employs. So for Volt owners, GM has managed to hide the battery degradation so yes, to a Volt owner, there is no degradation as the car ages.