04-18-2024, 09:28 PM | #1 |
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Question about 80percent
So I was told that to improve the battery life the best thing would be to set the max charge to 80% and switch to 100% on long trips. Since this is a lease and I don’t plan on keeping the car for more than 3 years should I be worried about this? Is this for battery longevity long term or for the short term? Hopefully someone understands what I’m asking.
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04-18-2024, 09:39 PM | #2 |
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While the first year generally sees the most degradation, the 80% rule is for long term battery health. That said, do you need all that range on a daily basis?
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04-19-2024, 05:42 AM | #3 |
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I charge mine to 90%. It’s a lease, so longevity is a non-factor to me. I like the extra few days between charges the additional 10% gives me.
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04-19-2024, 08:10 AM | #4 |
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Unless you need the range, why charge to 100% daily and degrade the battery needlessly for the next owner?
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04-19-2024, 08:56 AM | #5 |
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If you’re using a Level 2 charger at home then you aren’t going to cause much degradation in the long run regardless of whether you charge to 80%; 90% or 100%.
If all you do is use a DCFC charger, then keep it to 80% as much as possible for daily use and drive immediately if you go above 80%. That being said, if you don’t need that much range on a daily basis, just charge to 80% as it’s still going to get you well over 200 miles in most ambient conditions. |
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04-19-2024, 09:37 AM | #6 |
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If it's a lease, who cares? You're unlikely to meaningfully degrade your overall charge capacity during your ownership period even with charging to 100% all the time.
When charging to maximum capacity, you will generate more waste heat as the charging efficiency reduces more and more the closer you approach 100% SOC. So if the extra few wasted cents/dollars or the knowledge of the inefficiency is bothersome to you, then cap it at 80%. If you don't care and like starting the day at 100% no matter what, then just go for it. I cap at 80% because I don't need nearly that much charge, and I usually don't plug in until I'm down to 40 or 50%. |
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04-19-2024, 10:19 AM | #7 | |||
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I keep my car charged to 60% because my daily drives rarely exceed 100 miles. I keep my charge cycles shallow and I rarely, ever, charge to 100% because I want my battery and related systems to be in peak condition as long as possible. Eventually, when I sell my car, the next owner will receive the continued benefit of my care. This is my moral compass. Quote:
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https://www.midtronics.com/blog/is-i...hort%20circuit. I believe iX model years before 2024 have a 30% degradation guarantee. If the battery degradation over the warranty period ever exceeds 30% from new, BMW will replace it. I read that the 2024s no longer have the degradation guarantee, so if you're going to abuse your battery because you're in a lease and don't care about the next person, don't expect BMW to be of any help if your battery is delivering significantly less range in years 2 and 3 of your lease. |
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04-19-2024, 11:49 AM | #8 |
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3-4x a month, I charge to 100% percent since I take long drives to see my Mom at her care center. I use my Level II BMW Wallbox (love by the way).
During the week, I let my car go down to 20-30% before I charge. Some days I use the slow and gentle Level I charger (it makes me think the battery likes this ). Most times I keep my car between 40-80%, but I know in the "olden" days of EVs, a 100% charge now and then was good for "cell balancing", although I'm sure it is automatic. I also think about caring for the car, when someone buys it after me. But, when I need or want a 100% charge....I do not feel bad or guilty. Until I sell it or trade it in, I am making the payment I NEVER dcfc charge, as E.A. sucks...and my gut just tells me dcfc is really not great for the battery. I have been driving EVs and PHEVs since 2017, and I have never had any battery issues or worries. |
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04-19-2024, 11:52 AM | #9 | |
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This reminds me of the old debate about doing oil changes on a lease. I have leased many vehicles and every single one received regular maintenance and hand wash, and wax when needed. It's my car for the period of the lease and I don't want to abuse it. Charging is similar although easier than having to drive into a dealer for an oil change. Assuming you charge at home. I don't see the point in charging to high SoC if you don't need it other than feeling the anxiety of "I might need the full range for an emergency" but that's a very edge case that can be mitigated with a fast charge en route to your destination. My car lives in the middle band of the pack. If you pick any given day it will likely be between 40-60% SoC. I just checked this moment and I'm at 39% SoC. I don't charge until I'm close or below 20% and stop the charge around 70-80%. The exception is if I'm on a road trip then I'll go below 10% and charge up to about 60-70% if I'm DC charging with the exception of the first leg of a long trip which I schedule the AC charge to 100% to complete just before I hit the road. If I'm at a hotel with a L2 charger then I may go higher if needed for the next day of a multi-day road trip.
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04-19-2024, 12:29 PM | #10 |
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One reason to give a damn about how you take care of a lease, and especially how you approach battery charging is: what if you decide to buy out the lease at the end?
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04-19-2024, 04:11 PM | #11 | |
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04-19-2024, 05:02 PM | #12 |
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This is a fascinating study: https://www.sciencedirect.com/scienc...52484719310911
Abstract: The present study, that was experimentally conducted under real-world driving conditions, quantitatively analyzes the energy losses that take place during the charging of a Battery Electric Vehicle (BEV), focusing especially in the previously unexplored 80%–100% State of Charge (SoC) area. The results show that losses, during charging within the abovementioned area, are almost double compared to the 20%–80% SoC area and vehicle’s average specific real energy consumption is almost 2 kWh/100 km more, compared to what the driver sees on the EV’s dashboard. Furthermore, it is not for the driver’s benefit to exceed 80% of SoC during charging, considering the required charging time, the distance that each SoC area provides and the life expectancy of the battery itself. |
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04-19-2024, 09:32 PM | #13 |
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There is no way I would buy this car out of the lease at the end. I could never be convinced especially with the changes of CCS to NACS.
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04-22-2024, 07:33 PM | #14 |
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If one's ownership experience during the lease was positive and with few or no repairs, why the hesitation? Second, the CCS-to-NACS adapters that Tesla is making for Ford, Rivian, Mercedes, BMW, etc., accommodate a full 500A which easily maxes out the iX's charge rate. I don't think the shape of one's charge port is an important factor in whether one keeps the car after lease-end.
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04-29-2024, 12:05 AM | #15 |
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Another question regarding this. If choosing a setting higher than 80 percent what is ideal? I know charging to 100 percent is wasteful. Is 95 the highest to go that is most efficient but still gets you a higher mileage than the 80?
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04-29-2024, 01:28 AM | #16 |
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Alright boys, this is what you’ve been waiting for. I ponied up for the $19.99 Bimmerflow charge and here is my data at 56k miles with 95% EA DCFC.
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04-29-2024, 03:55 AM | #19 | |
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Just do whatever is convenient, the BMW battery management system has got us covered! I lose my free EA that I’ve milked for 20+ MWh in 3.5 months 😅 so that degradation will level out at 85-90% the next 2 years. |
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04-29-2024, 04:12 AM | #20 | |
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Do not take the health reported seriously, I think BimmerFlow needs a lot more data … it seems it’s getting more users and that will help them. My battery was 2% below community average and a week later I’m 2% better than community average at 94% and 50K km’s I only fast charge on roadtrips 2x a year and keep my battery between 20 - 80 most of the time. My cardata gives a 200 out of 200 score on battery … |
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04-29-2024, 08:07 AM | #21 | |
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I charge mine to 90%. My reasoning is that the last 10% gives plenty of buffer for regenerative braking. And that extra 10% (above the traditional 80) gives me an extra few days between charges.
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04-29-2024, 08:45 AM | #22 |
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You don't need a buffer for regen, the vehicle behaves the same at 100% as it does at 90%.
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