[Johnny_id4]

Hi everyone,

I'm aware that fast charging degrades batteries but wanted to get some insight about AC charger with the scenerio below.

I read somewhere that it doesn't matter how long you charge, but every time you charge it is considered as a charge cycle.

Can someone confirm this and if the number of charging cycles can degrade the batteries?

Reason for my question is that there is free charging with level 2 at my work place and I don't have one at home. Hence, I plug in my car everyday at work which provides 10kwh. I manage to keep my SoC around 70-80 percent. Is this okay?

 

[Nai3t]

That's not the way I've come to understand it.

What I've read from various sources (and this is more from my past two years with the i3, not the ID.4) is that if you consider 0 to 100 as one full charging cycle, then five sessions of 20% is the equivalent of one full 100% cycle.

 

[ChristophW]

That's not the way I've come to understand it.

What I've read from various sources (and this is more from my past two years with the i3, not the ID.4) is that if you consider 0 to 100 as one full charging cycle, then five sessions of 20% is the equivalent of one full 100% cycle.

Exactly, well said.

 

[agzand]

Hi everyone,

I'm aware that fast charging degrades batteries but wanted to get some insight about AC charger with the scenerio below.

I read somewhere that it doesn't matter how long you charge, but every time you charge it is considered as a charge cycle.

Can someone confirm this and if the number of charging cycles can degrade the batteries?

Reason for my question is that there is free charging with level 2 at my work place and I don't have one at home. Hence, I plug in my car everyday at work which provides 10kwh. I manage to keep my SoC around 70-80 percent. Is this okay?

Yes, you can also skip a day or two, go from 60% to 80% every other day.

 

[JimmyVW]

Well there is also a wear factor in the equitation, and charging between 20% and 80% (and with lower speeds) will contribute less to the wear, then going outside that range.
It’s in essence exactly the same as charging your (I)phone, but on a larger scale

 

[Huey52]

Let's be reminded we have an 8-year warranty on our ID.4 batteries. As such I'm not too worried as to its charge-cycle wear. Heck, VW's own ad campaign implies nightly charging.
[but I do mostly L2 charge from ~50-80%, just because ]

btw: For awhile upon purchase of my iPhone 12 mini I was trying to only recharge when it got down to 40% and then removing it from the charge cradle promptly when recharged, as my prior 6s battery charge duration significantly declined with age. But now I'm back to just leaving the 12 in the nightstand cradle. 🤷‍♂️

Well there is also a wear factor in the equitation, and charging between 20% and 80% (and with lower speeds) will contribute less to the wear, then going outside that range.
It’s in essence exactly the same as charging your (I)phone, but on a larger scale

 

[Don]

Let's be reminded we have an 8-year warranty on our ID.4 batteries. As such I'm not too worried as to its charge-cycle wear. Heck, VW's own ad campaign implies nightly charging.
[but I do mostly L2 charge from ~50-80%, just because ]

VW recommends only charging to 80% unless you need a full charge that day. One of the worst things you can do is to leave the battery sit for extended periods when charged to 100%

If VW's 8 year warranty is like most manufacturers warranties, it won't cover any reduction in capacity - So long as the battery fully recharges to whatever AH capacity it has left, that's considered normal wear and tear and not a defect covered by the warranty, so it still pays in the long run to be careful how you treat your battery if you want the best performance from it

Don

 

[JPWhite]

If VW's 8 year warranty is like most manufacturers warranties, it won't cover any reduction in capacity - So long as the battery fully recharges to whatever AH capacity it has left, that's considered normal wear and tear and not a defect covered by the warranty, so it still pays in the long run to be careful how you treat your battery if you want the best performance from it

Don

All EV manufacturers I know of have a capacity warranty in addition to the standard workmanship warranty. Nissan even introduced a retroactive capacity warranty on the LEAF. I signed paperwork at purchase saying I understood the car came without a capacity warranty, but Nissan added one anyway months before they lost a lawsuit.

 

[Nai3t]

... If VW's 8 year warranty is like most manufacturers warranties, it won't cover any reduction in capacity ...

70%

 

[Don]

Nissan did so because their air cooled battery technology in their early model Leafs was probably the worst battery ever put into an EV. They were reluctant to do so, but because of the terrible reputation it was getting them, they had little choice.

Mitsubishi added 2 years to their 8 year warranty, but loss of capacity is not covered - So long as it charges to 100% of current capacity, any loss of capacity is 'normal wear and tear' - We signed an understanding to that regard in the dealers showroom before we bought the cars. I'm pretty sure GM's warranty is similar on the Volt we recently sold

In 9 years of driving the two we own, we're now at about 18 to 20% lost, so not too bad

If anyone has a definitive answer to what VW warrants as to battery capacity loss, please post it here - I would love to know and I'm sure others would as well. If they do warrant capacity loss, there must be some definitive number stated in the warranty, such as "Loss of more than 30% would be covered"

Thanks!

Don

 

[Don]

If it is 30%, that's a pretty huge loss, so all the more reason to be mindful of how you're treating your battery. That would take your range down from 250 to 200 miles on a good day, so that's very significant

Can anyone link to that number stated in the warranty?

Don

 

[Nai3t]

Nissan did so because...

Mitsubishi added 2 years ...

also BMW: 8 / 80,000 / 70%

Polestar: 8 / 100,000 / 70%

 

[SunWizard]

Can anyone link to that number stated in the warranty?

Yes, searched on battery warranty 70 and got:

The High-Voltage System Limited Warranty provides that the battery will still have at least 70 percent of its original capacity after eight years of operation or 100,000 miles, whichever occurs first.

direct from VW press release.

 

[Huey52]

I have my Max charge set in-vehicle to 80%.

8-year warranty is to a guaranteed battery capacity not less than 70%.

VW recommends only charging to 80% unless you need a full charge that day. One of the worst things you can do is to leave the battery sit for extended periods when charged to 100%

If VW's 8 year warranty is like most manufacturers warranties, it won't cover any reduction in capacity - So long as the battery fully recharges to whatever AH capacity it has left, that's considered normal wear and tear and not a defect covered by the warranty, so it still pays in the long run to be careful how you treat your battery if you want the best performance from it

Don