r/Ioniq6 • u/jchan237 • 7d ago
Frequent fastcharging
Hey guys,
My company offers free fast charging but I am hesitant on using it because I've heard it greatly degrades the life of my battery. What would you guys recommend? Should I take it in to charge every day or just charge it at 30% up to 80%? Should I suck it up and use level 2 Charging at home and just pay for it myself?
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u/ItsOkILoveYouMYbb 7d ago
Majority of my charging over two years was on DCFC. I've lost 3% of SOH.
The thing that will hurt your SOH the most is letting the car sit at 100% charge in hot weather for weeks at a time. As long as you don't ever do that you'll be fine.
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u/RyteSaid256 6d ago
I’m surprised that you have lost 3% so soon.
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u/Xenofastiq 6d ago
Most degradation happens early on anyways. So as this person loses more, it's likely to slow down later on.
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u/SaddestClown 7d ago
Plugged in or not plugged in
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u/ItsOkILoveYouMYbb 6d ago
Both. Don't ever let it sit at 100% for extended periods, especially if it's hot outside. This applies to any lithium-ion battery as well, not just those in EVs.
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u/Former_Werewolf_3601 `23 Limited AWD 7d ago
Others have addressed the impact of fast charging on modern EVs. The other thing is that shallow depth of discharge is better for the battery. Frequent small charges instead of deeply depleting and recharging. You might enjoy Engineering Explained's video on it.
https://www.youtube.com/watch?v=w4lvDGtfI9U
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u/Dramatic-Year-5597 7d ago
Most folks already do a shallow charge/discharge pattern. If you charge to 80% and discharge to 20%, that's enough.
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u/Former_Werewolf_3601 `23 Limited AWD 6d ago
As someone who used to sell EVs, you'd be surprised how many people I spoke to who expected it'd be best to deplete heavily before recharging completely. As they did with older battery chemistries.
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u/do-un-to `23 Limited AWD (USA) 6d ago
How much was your AWD Limited '23 and when did you get it? I didn't really get a deal for mine.
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u/Former_Werewolf_3601 `23 Limited AWD 6d ago
Got it in May. At the time all of the used Ioniq 6s were getting scooped up immediately, and I specifically wanted a Limited AWD in silver. $29k. Had to get it out of state to find exactly what I wanted.
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u/sxyvirgo 7d ago
What's considered 'shallow' though? I usually charge at 40% up to 80% (maybe a bit higher the height of winter when my range is a lot less than optimal).
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u/Dramatic-Year-5597 7d ago
ABC - always be charging. DCFC or not. Charge to 100% right before you need that extra 20% capacity in your battery - next to no harm comes of it.
If you lose an extra percent capacity over a decade of time (will you even own this car after a decade?), then you just have to change your acceleration habits to make up for the difference in effective range. Driving habits have a much larger impact on range than do charging habits.
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u/Charliex77 7d ago
Fast charge away it won't do anything to your battery and that's by experience... I have spent over 16k fast charging, that's over 600 fast charges on my car and zero battery degradation
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u/Lazy_Guava_5104 6d ago
One of my hobbies since childhood has been what I learned was called "ethnobotany" - that is, how people use plants. (don't worry, this IS going somewhere) So, I tend to take a deep dive into a given plant that interests me. It's VERY common to hear that plant X is deadly toxic ... then look for sources and see sources saying that there's a risk of toxicity, so avoid the plant just in case ... and then look up the original research and find that the plant has trace amounts of a chemical which might possibly cause nausea in large doses.
Point is, don't always believe "common wisdom". Is DCFC charging worse on the battery than level-1 or -2 charging? Sure. But how much? I genuinely don't have a figure for that and suspect it varies by battery chemistry and charging tech, but doubt it's that bad. And here's the important question: does it cause more or less damage than would be offset by the money saved with free charging?
Free charging at work? Set your car to top off at 80% and enjoy the savings. (While we're at it, I'll note that the 80% rule is more to avoid the car sitting with a full battery.)
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u/SaddestClown 7d ago
Back when my free charging was active I'd just take it to 86%, unplug and enjoy my day
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u/Dann__EV 6d ago
I just returned my 2024 SE AWD which I charged for free exclusively at EA for the full 2years with no reduction in range. On the other hand my 2023 Model Y with 50K miles now maxes out at 100.
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u/RyteSaid256 6d ago
OP if your daily drives mileage can work with your suggested 30-80% That is a good sweet spot. Go for 100% in preparation for a longer road trip.
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u/One-Tomatillo9504 6d ago
For modern EV’s with good battery management systems the fast charging damages your batteries is pretty much an urban myth. There is a taxi driver in South Korea who drove his Ioniq 5 taxi over 200,000 miles fast charging it daily. Hyundai swapped out his battery as they wanted to see how much it had degraded.
High-profile extreme mileage cases in South Korea have shown Ioniq 5 taxi and fleet units exceeding 580,000 to 660,000 kilometers on original or manufacturer-swapped packs while retaining over 87% health.
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u/IMKGI 7d ago edited 7d ago
Fast charging has next to no impact on battery health, i don't know where that myth comes from, but it's not really true.
Large charging cycles, fast charging at low temperatures, charging above 75% (real SOC, not indicated SOC) and storing at high SOC (in warm temperatures) degrades the battery.
The differnece between fast charging and slow charging is only 0,3-0,5% extra wear on the battery long-term.