oko
Posts: 23
Joined: Sat Sep 07, 2013 8:48 am
Delivery Date: 25 Mar 2013

A real life example why charging to 100% is bad

Tue Jul 17, 2018 12:01 pm

Here's a nice article about a Tesla hitting 400K miles:

https://www.teslarati.com/tesloop-tesla ... ance-cost/

Here's the relevant part:

"Average battery degradation over the vehicle’s first 194,000 miles was around 6% with multiple Supercharger stops every day. Between 194,000 – 324,000 miles, the HV battery degradation was estimated at around 22%. According to Tesloop, this was likely due to the company’s practice of constantly charging eHawk to 95-100%, instead of Tesla’s recommended 90-95%".

Note that they probably drive the car immediately after charging, so the theory "it is okay if you drive immediately after 100%" seems to be incorrect.

Fortunately I have 2013 leaf, where you can stop at 90%.

User avatar
davewill
Posts: 4933
Joined: Thu Mar 17, 2011 6:04 pm
Location: San Diego, CA, US

Re: A real life example why charging to 100% is bad

Tue Jul 17, 2018 1:18 pm

That may have been part of it, but I think it's also likely because of having to supercharge several times a day.
2014 Rav4 EV, Blizzard Pearl White
2011 LEAF SL w/QC, Blue Ocean, returned at end of lease

Reddy
Posts: 1534
Joined: Fri Feb 11, 2011 3:09 pm
Delivery Date: 18 Aug 2011
Leaf Number: 006828
Location: Pasco, WA

Re: A real life example why charging to 100% is bad

Tue Jul 17, 2018 1:34 pm

I believe that Tesla replaced the battery at just shy of 200,000 mi (probably the 194K above), so it's more likely that this is the difference between the old and new (Si-C) battery technology. There have been a bunch of people complaining about the newer 90KWh batteries degrading faster than the older 85 KWh batteries.

EDIT: Yup, just read this article. Tesla replaced the batteries at 194K and 324K miles:
https://www.tesloop.com/blog/2018/7/16/tesloops-tesla-model-s-surpasses-400000-miles-643737-kilometers
Reddy
2011 SL; 9 bar, 45.80 AHr; 45,000 mi; rcv'd Aug 18, 2011
Long: http://www.mynissanleaf.com/viewtopic.p ... al#p226115"
Cold: http://www.mynissanleaf.com/viewtopic.p ... 60#p243033"

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