3 Common Mistakes That May Harm Your EV Battery - Engineering Explained

[Administrator]

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[ciaranob]

Good video and for addl. ref., the original (by Dr Jeff Dahn) along with this is posted in first post of the Baseline Soh thread here:

https://www.taycanforum.com/forum/threads/baseline-for-hv-battery-soh-performance.12815/

 

[R Benny Waered]

YT videos aften too long these days - anyone got a 20" summary pls?

 

[PedroJ]

YT videos aften too long these days - anyone got a 20" summary pls?

AFFAIR
Don’t store your battery charged to 100%. 30% for staring is best
Don’t wait with recharging. Best is tegular charging.
Don’t charge to 100% regularly. Daily charging to max 75%-80% is best. If range is needed - charge to 100% and go

Nothing new or unknown - but explained with theory understands for average user.

 

[R Benny Waered]

Thanks Pedro. Do all that. Always start using any 100% charge within an hour of reaching it. Cheers.

 

[Miketaycan]

Why? Taycan has reserved capacity, just let it manage the battery. I don't see any harm in keeping it at 100% a few days.

 

[snstevens]

[Posted originally here, but decided the content might benefit folks new to the Taycan so I’m moving it up to it’s own thread.]

Either on this forum, or in my random reading, I came across this video. It is a 13 min video summary of a 1 hour lecture on battery chemistry and its effect on battery health, and it offers a few simple rules to maintain the long-term health of your EV battery. I personally found the battery chemistry part interesting, and I’m sure you’ve come across some version of these rules, so if you don’t want to watch the video (which is good BTW) here is the Cliff Notes summary.

• Rule #1 - Don't store your Battery at 100%
  • Store at a Low SOC in a Hot Environment -- If it's hot, keep the SOC at 30%.
  • Store at any SOC in a Cold Environment -- If it's cold you can store your car at 85%.
• Rule #2 - Don't wait to Recharge (Routinely)
  • Plug-in After Every Trip -- Generally top out your charge at 75% or 85%.
  • Stick to low SOC ranges -- Stick to a 25% range of use. For example if you charge to 85%, recharge when you get down to 60% (a 25% range).
• Rule #3 - Don't charge to 100% (Routinely)-- Save this for the night before a long trip, or if you are entering Montana.
  • DC Fast Charging is OK -- The charger will control the charging current so that it won't charge faster than the EV battery can handle.

The idea of "sticking to low SOC ranges" and charging frequently to maintain battery health is a bit new to me, so I pass it along for your consideration. YMMV.

UPDATE - Thanks to @Administrator for linking these together. Perhaps I did find this originally on the Forum ?

 

[snstevens]

Why? Taycan has reserved capacity, just let it manage the battery. I don't see any harm in keeping it at 100% a few days.

The only issue would be ambient temperature according to the video. High temperature (e.g., you‘re in Arizona in the summer) will cause battery degradation even if the car is just sitting.

 

[ZenicaNC]

Doesn't the Taycan, much like A Tesla, regulate the battery temperature? It's unclear to me whether the Taycan does this 24/7 continuously or only during operation or precool/heating. Personally, I'd drive it and use it however it is convenient for you. With a slant towards failure at around 99k miles. lol

I'm sure Porsche has a minimum charge threshold before entertaining a warranty replacement. Anything above 79% (made up arbitrary percentage) is considered normal degradation. I'm pretty certain they already know what the lowest percentage these batteries will be at with 100k miles and set the bar 2 points lower.

 

[kempez]

I follow these rules as a generality. I have once charged to 100% and then had to leave it for a few days which I was annoyed about (boot broke and needed a car with a boot!), but I figure once out of the battery lifetime is fine. I charge little and often if I can and I rarely set 100% unless I am going to use circa 50% or more. I also avoid fast charging if at all possible and really I rarely need to so that's pretty easy. Good advice though and interesting to hear why

 

[ShiftyWolf]

Tesla has seen that EV batteries are maintaining a higher SOH than was previously expected, and independent testing has also shown this to be true. My brother drives an older Model S and said his SOH has decreased by 1% or less each year of ownership. I'm watchful of my battery life but not fearful of it. In the US, at least, the 8 year warranty will replace the battery if SOH drops below 70%.

 

[ZenicaNC]

I spent time with the dealer shop foreman to review any possible customizations possible via PIWIS, long story short: there really aren't any, at least that I wanted.

The dealer quoted me like $5800 to upgrade the on board AC charger. It's a hard pass from me.
In part due to the cost but hearing that someone that did it had issues with errors and lights is an omen to leave well enough alone.

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