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

[mkhuffman]

A wider tire does NOT mean more rubber on the road. Rubber touching the road 'aka' contact patch is related to vehicle weight, and it countered by tire pressure and sidewall strength. If that's your main point about Jason being wrong, I'd politely urge you to rewatch some of his videos with a more open mind.

-Mechanical engineer working for an integrator in the automotive field.

And where in his video did he address that point and prove it either way? He didn't. He ignored it. That is lazy at best. And definitely misleading. And it is not the only issue with the video.

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[Unobtanium]

Been saying for years. Charge charge charge. There are so many people on this forum. that wait till their battery gets to 20% or 30% to charge
no always have it charged set to 80%/90% ? after driving and keep it plug in??‍

People are stupid, don't buy used EVs.

 

[dbsb3233]

People are stupid, don't buy used EVs.

That's likely to be big drag on the used EV market when they get more than maybe 5 years old... buyers' fear of not knowing the battery degradation and actual range. GOMs are pretty worthless, and few buyers are gonna whip out an OBD2 and try to find an SOH reading. (Not sure any of us know exactly how to interpret it even if we did). That will be a dark cloud hanging over the used EV market.

Yes, the engine can always have a problem when buying a used ICE too, but there's usually repairs than can be done that don't cost $15k. With a used EV you pretty much are just stuck with what you get.

The good news is that most batteries in the last 5 years haven't been degrading much. A used EV buyer *probably* won't be getting serious degradation, at least for the first few years. But we're still too early in the EV game to really establish those track records. People want to see what the 8th year and 100k miles will look like too, and there's not a lot of real life examples of that yet.

 

[Unobtanium]

That's likely to be big drag on the used EV market when they get more than maybe 5 years old... buyers' fear of not knowing the battery degradation and actual range. GOMs are pretty worthless, and few buyers are gonna whip out an OBD2 and try to find an SOH reading. (Not sure any of us know exactly how to interpret it even if we did). That will be a dark cloud hanging over the used EV market.

Yes, the engine can always have a problem when buying a used ICE too, but there's usually repairs than can be done that don't cost $15k. With a used EV you pretty much are just stuck with what you get.

The good news is that most batteries in the last 5 years haven't been degrading much. A used EV buyer *probably* won't be getting serious degradation, at least for the first few years. But we're still too early in the EV game to really establish those track records. People want to see what the 8th year and 100k miles will look like too, and there's not a lot of real life examples of that yet.

Over on the ev6 forum we have a fair bit of 100k+ mile samples. @5% degradation is typical.

 

[Teslaeata]

Good thing there is about a 10-20 mile reserve charge for those crazy situations

???????

 

[mkhuffman]

Over on the ev6 forum we have a fair bit of 100k+ mile samples. @5% degradation is typical.

5% at 100k is excellent. I don't think that will happen with our MMEs, though. I have already lost 7.5% and have yet to hit 40k miles.

 

[Dr Obnxs]

I am sure he is a nice guy. But watch his wheel size video and tell me he did a thorough analysis of all the wheel related factors that impact range. He didn't. That is why I have an issue with his videos. Not him personally, but his work products.

If he wants to pass himself off as an engineer whose opinion can be trusted, then he should do better work. So far, he has proven he cannot be trusted. At least to me.

I watched the video. What are your issues with it?

 

[mkhuffman]

I watched the video. What are your issues with it?

https://www.macheforum.com/site/thr...ttery-engineering-explained.33402/post-747775

 

[Dr Obnxs]

https://www.macheforum.com/site/thr...ttery-engineering-explained.33402/post-747775

Contact patch size is just tire vehicle weight divided by tire pressure. A wider tire has a wider, but shorter contact patch. There is no 59% more rubber touching the road.

 

[mkhuffman]

Contact patch size is just tire vehicle weight divided by tire pressure. A wider tire has a wider, but shorter contact patch. There is no 59% more rubber touching the road.

He didn't even address it. He ignored it. It is definitely a factor that should be considered regarding wheel efficiency.

And that isn't the only issue with the video.

 

[RandyMache]

no worries.

when the display says 0% or 100%, there is still a buffer.....
and a warranty.

You are 100% correct.

 

[averyintucson]

I like the article at Battery University:
https://batteryuniversity.com/article/bu-1003a-battery-aging-in-an-electric-vehicle-ev

This has a lot of detail, but also has simple guidelines at the end.

 

[ryannix123]

People are stupid, don't buy used EVs.

What? Given the massive depreciation, you're only stupid to buy a new EV!

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