[bceye]

I've came across posts that one should charge to 80% instead of 100% for daily usage. I see in the manual that 80% is also recommended.

What type of degradation are we talking about if one were to charge to 100% every day? Is it a few miles loss in range after couple of years?

[VirtualGuitars]

To enhance your battery’s long-term capacity, I would not charge past 80% on a regular basis unless you need the extra range. If you charge to 100% on a regular basis, your battery capacity will diminish much like a cell phone. It may say 100%, but it may not be able to charge to it’s original, full capacity. That warning is there for a reason.

You’re probably going to get other people on here saying that they charge 100% and haven’t seen any degradation, but you will see it after several years. Note the iX has only been out for about 2 years, so no one has probably noticed yet. If you buy a new car every couple of years, then it’s probably not something you need to worry about.

[Barry123]

^^^ I agree. Coming from 8 years with a Tesla, I charged that to 80-90% most of the time. If I needed a full charge for a trip, I'd charge to 90% the prior night, then top it off to 100% just before leaving in the morning.

I just got a new Samsung phone and it's the first phone I've owned with a battery saving setting, which max charges it to 85%. Other devices with Lithium batteries (shaver, bike trip computer). I manually pull them at about 90% when recharging.

Does anyone know how much difference it REALLY makes? Probably not.

[drbluedevil]

Another thing to consider is efficiency. It becomes much more energy INEFFICIENT to cram electrons against their charge gradient as that gradient becomes larger. In other words, the closer a battery gets to full, the more energy gets wasted just trying to get that battery to a maximum charge. So unless you need that extra 20%, you'll waste less money on charging. That said, I'd bet most people who can afford one of these things probably don't care at all about the extra few bucks (or frankly what happens to the battery long after they've traded the vehicle for another one)

[Bevforme]

IMHO. Those who buy and intend to keep their EV for many years may care about this. Short term owners, leasing and those driving buisiness owned cars may not care, with some exceptions.

Deg on an ICE is not seen but still occurs. A hammered ICE car can fail quicker than a well looked after engine. Also low mileage ICE, not ever run at peak operating temps, can also be detrimental to them , but there is no metric or service equipment to interrogate it.

I own and intend to keep the iX for a few years, and generally only AC charge to 80% but simply because the range on the 50 is so good that I don’t need to go above 80% for most of my trips. Often I only charge a couple of times a week with my 7.4kW home ‘charger’ and rarely charge with DC.

Long trips, sure I hit 100% on AC ahead of the trip, but on the trip I generally only charge to around 80% DC, simply because the charge curve tails off and I’m better covering miles at speed rather than sitting waiting for 100%, plus it frees up the charge point for someone else… this has nothing to do with deg or battery preservation, it just means I cover the miles/charging stops more effectively.

I find the long trip planning for the EV enjoyable (sad but true) and I wouldn’t go back to ICE after embracing EV for the last 18 months.

And yes, I used to be a V8/V10/V12 gas guzzler guy.

Back on thread. I guess there is no prescribed action, other than what suits your individual situation/needs.

[MAMOHT]

The rule is to keep the battery between 20 nd 80 % charge on a daily basis. If you need to charge to 100% and go down to 0 once in a while it is fine too.
Also, every battery is different. Same as on cell phones. Some batteries may die in a year and some last seemingly forever.

[VirtualGuitars]

Originally Posted by MAMOHT

The rule is to keep the battery between 20 nd 80 % charge on a daily basis. If you need to charge to 100% and go down to 0 once in a while it is fine too.
Also, every battery is different. Same as on cell phones. Some batteries may die in a year and some last seemingly forever.

That’s exactly what I do. Charge it to 80% and don’t plug it in until it drops below 20%. If I go out of town. then I take it up all the way, But that’s pretty rare.

[darylp310]

Originally Posted by Bevforme

I find the long trip planning for the EV enjoyable (sad but true) and I wouldn’t go back to ICE after embracing EV for the last 18 months.

Me too. It’s like a puzzle to solve each time. Also I enjoy chatting with other EV owners at the EA stations. Sadly I look forward to it each week because I’ve become a total EV nerd!!

[NomoTesla]

Shallow charge cycles are better for the battery's longevity and long-term degradation profile than deep charge cycles that recover 50% or more of the battery's capacity. Li-ion batteries prefer a 50% state of charge when not being used.

I only charge for the miles I expect to use and most often keep the car in the 30%-60% range. Unless you drive a lot of unexpected miles (I do not), there's no good reason to keep the car charged to 80% if you aren't going to drive the miles. A full gas tank doesn't cause the gas tank to shrink, but the opposite is true when dealing with EVs and battery charging.

Also, folks new to EVs should be aware that most manufacturer battery warranties have limited coverage for degradation. Usually the battery has to degrade > 30% to trigger a repair or replacement.

[SteveX3M40i]

90% daily - as we are unlikely to keep car beyond its 5 year warranty period!

[VirtualGuitars]

Don’t forget that we still have a 8 year battery warranty. I seriously doubt many of us will keep our iX’s for that long…

[Barry123]

Originally Posted by VirtualGuitars

Don’t forget that we still have a 8 year battery warranty. I seriously doubt many of us will keep our iX’s for that long…

I kept my Tesla that long, even though I hated it for the last few years. It was a place-holder until something else came along that had a couple of years under its belt.

So we shall see...

Also, it depends what exactly the warranty means. For example, there were people who tried to claim warranty replacement with Tesla for 20% degradation after 4 years and they were told that was within limits of normal degradation. OTOH, I know someone who had a 15% drop overnight and they found a bad module and replaced it.

[Paladin1]

BMW warranties degredation of 13% or less over 8 years. I'm not aware that they specified any particular treatment of the battery, although that could be in the fine print.

[VirtualGuitars]

Originally Posted by Paladin1

BMW warranties degredation of 13% or less over 8 years. I'm not aware that they specified any particular treatment of the battery, although that could be in the fine print.

I think you meant 13% or more?

[ggalanis]

Originally Posted by Paladin1

BMW warranties degredation of 13% or less over 8 years. I'm not aware that they specified any particular treatment of the battery, although that could be in the fine print.

I think you meant to say 30%

[Paladin1]

Originally Posted by VirtualGuitars

I think you meant 13% or more?

Yep, my bad - should be 30% (poor phrasing: degradation of 30% or less means no more than 30% ). Researching, looks like the warranty has been slightly modified from a couple of years ago - in addition to 8 years/100,000 miles for defects in workmanship, the following applies for high voltage batteries:

Due to its inherent technical design, the high-voltage lithium-ion battery’s capacity will decrease over time and with use. If an authorized BMW center’s capacity check concludes that the net battery capacity is less than 70 percent of its original nominal value when it was new, this level of capacity loss is considered excessive.

So that would be 30% or more (again, treatment of battery unspecified). And interestingly, reading the intent of the stated warranty, if that reduction occurred before the 8 year warranty period the battery would qualify for replacement or repair, reading nothing to the contrary.

[Eucerin]

Should you care if you are leasing?

[VirtualGuitars]

Originally Posted by Eucerin

Should you care if you are leasing?

Nope. That’s the next guy’s problem.

[redhot47fla]

Originally Posted by VirtualGuitars

Don’t forget that we still have a 8 year battery warranty. I seriously doubt many of us will keep our iX’s for that long…

If I keep any vehicle for more than eight MONTHS, my wife considers it a win.

[VirtualGuitars]

Originally Posted by redhot47fla

If I keep any vehicle for more than eight months, my wife considers it a win.

At my wedding my ex-father-in-law announced in the time he had known me that I was on my fourth vehicle, so I can relate!

[Fast400]

So I guess I'm one of the few that plans on keeping this car very long unless anything unforeseen happens.
That being said, I bought mine used with 9000km's (5months old). My assumption is that the original owner charged rapidly and to 100% (charging wasn't limited in idrive). This DC charging would have happened approximately 25x to accumulate the 9000km's.
Anyone know if that's enough to start degradation? Secondly, by charging slowly, 11kW or less, can the battery recover a little from the potential fast charging?

[boogysbmw]

Originally Posted by Fast400

So I guess I'm one of the few that plans on keeping this car very long unless anything unforeseen happens.
That being said, I bought mine used with 9000km's (5months old). My assumption is that the original owner charged rapidly and to 100% (charging wasn't limited in idrive). This DC charging would have happened approximately 25x to accumulate the 9000km's.
Anyone know if that's enough to start degradation? Secondly, by charging slowly, 11kW or less, can the battery recover a little from the potential fast charging?

You are wasting to much of your time and energy worrying about this. Just charge the car and enjoy it . I personally do most of my charging DC because it’s free and it’s at my grocery store so why not but that’s also maybe 3 times a month. I only charge to 100 for long trips which barely ever happen since with my commute, an 80% charge down to 20% can last me an entire week.

I also do not plan on keep this car for over 3-4 years. Shit I was already looking at the rivian R1T since I would love to have a pick up truck again 😂