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The art of noticing
(lemmy.nz)
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this post was submitted on 02 Sep 2026
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For the sake of the longevity of your battery, try to never let it go below 35% and never above 80%.
English YouTube video by a Chinese bilibili channel HTX studio doing phone battery testing, testing every phone for 500 cycles in different conditions
These guys tested three phones per bucket for 500 charge cycles. Tl;dw:
iPhones lost 11.8% when slow charging for 500 cycles, 12.3% when fast charging, and 8.3% when fast charging from 30% to 80%.
The IQOO phones lost 8.8% when slow charging for 500 cycles, 8.5% when fast charging, and 6.0% when fast charging from 30% to 80%.
Only using half the capacity does make a difference, but you'll only see longevity differences after multiple years, and only small differences then. These tests took 167 days, but the phones were charged and discharged 3 times a day on average, running heavy software to drain the phones quickly.
What I assume to be the reason for the difference between iPhones and Android phones is the maximum battery capacity. The iPhones started out with a much lower capacity battery to begin with, and even now iPhone batteries are sometimes pitifully small, so any wear and tear is magnified.
Also nowadays there are silicon carbon batteries which haven't proven their longevity yet. There are rumors about lower longevity, because they expand and contract more during use. There hasn't been independent testing to verify that yet. What has happened is that multiple Chinese phone generations have had silicon carbon batteries, and now even Samsung is offering phones (new z fold 8 line, soon S27 and more) with a small amount of silicon carbon, increasing the capacity about 10% beyond what lithium would provide.
I use a silicon carbon battery on my phone. 7k mha is crazy good for my needs, it's +40% from a 5k. But for anyone planning on buying them know that the higher the capacity for size the worse their life span should be in theory, since the difference is just the silicon to graphite ratio. More silicon = more capacity but worse life span and more graphite = longer life span but lower capacity. So just because a battery is silicon carbon doesn't tell much about how long it will last, since you can have a SC battery with 5k and 10k mha that would have completely different results.
It's okay I am using a Fairphone. I can just swap the battery easily.
Sure, but why create more e-waste? Might as well make the battery you have last.
Batteries can be recycled pretty well actually.
There are limits to how far people are willing to go, and you're talking to someone who already bought a Fairphone. Maybe not someone you should be overly concerned with, all things considered.
While true, this affects about less than 1% of the battery life and thefore can be ignored
What's this claim based on? The amount of cycles required for the battery to degrade to 80% of capacity is quadrupled when discharging between 80% and 35%. That doesn't really seem to be compatible with the claim of "1% of the battery life"
I pulled it out of my ass.
However I remember a video where someone tested phone batteries and came to the conclusion that you get about 100 days more usage out of the battery when using slow charging and only to 80% in comparison to fast charging and 100%.
While the batteries themselves are good for several years.
Also they stopped at about 60-70% capacity because after that you usually want a new battery.
If I find the video I link it here. Probably most numbers I said are wrong. My memory is just that it doesn't matter whether you care for your phone battery or not.
Mostly because the software already handles the shit.
Edit: the video: https://youtu.be/kLS5Cg_yNdM
Apparently I remember stuff that didn't happen