this post was submitted on 08 Mar 2026
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I feel like this is the important detail here...
When buying a car, you can't have a clue whether that is the case.
I used to believe fast charging is harmless in phones too. It isn't. I charge my phone only to 80%, and not daily. I haven't lost a single % of battery health in almost a year. Meanwhile my friends charge to 100% and very often, always on fast charging. I got a friend to install accubattery to check their health and it was at 93% after only about 1.5 years.
Tl;dr: I suspect the driver will be dogshit and cause batteries to get destroyed in anything but the flagship car models to increase battery service revenue BY A LOT...
Do I understand correctly - you charge to 80%, have zero degradation, but also only use 80% of your battery at most because of that.
Your fast-charging friend, meanwhile, has been using all 100% down to 93% battery for these 1.5 years. Maybe, in a bad scenario his battery will degrade to 80% in 1-2 years and he'll start using only 80% of his like you?
Where's the upside in this, unless you're both planing to use same phone in e.g. 5 years and you might get ahead in battery capacity finally?
Every time I’ve seen someone test this hypothesis - as in doing a long-term experiment with the specific purpose of testing whether fast charging harms battery health - the result has come back that it doesn’t make much deference at all
It’s also worth pointing out that every battery is different and apps like Accubattery are imprecise. It’s entirely possible that your 100% and your friend’s 93% are actually exactly the same. It’s also possible that their battery would have displayed 93% when brand new
I crossreferenced my testing a lot though I cant 100% guarantee what I found is accurate.
Though I can say this: I don't think built-in health monitors in phones are worth a damn. My gran's phone was showing at 100% health when accubattery was at a whopping 73%. Testing the old and new battery, the new battery held up just about 30% more time than the old one on youtube playback.
I did other things that I wont get into
This is why I chose to trust accubattery and pretty much invalidate other testing in my head. I know it's one single test and sample but this is my information and I trust it at lleast for now.
93% after 1.5 years works just fine for most users who do not prioritize longevity or sustainability over convenience, unfortunately.
Some phones get over 70°C while fast charging, which is not healthy for the battery first.