this post was submitted on 09 Nov 2025
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Is Fast Charging Killing the Battery? A 2-Year Test on 40 Phones (www.youtube.com)
submitted 3 days ago* (last edited 3 days ago) by popcar2@programming.dev to c/technology@lemmy.world
179 comments fedilink hide all child comments
 

TL;DW: Fast charging over 2 years only degraded the battery an extra 0.5%, even on extremely fast charging Android phones using 120W.

And with that, hopefully we can put this argument to rest.

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[–] frongt@lemmy.zip -1 points 3 days ago (2 children)

Best source I can find: https://eugen-barilyuk.medium.com/how-i-realized-android-battery-percentage-wasnt-serious-enough-0310e484d874

3.7v is 0%, 4.2v is 100%. But a lithium battery can go higher and lower, it's just that doing that can harm the battery, perhaps spectacularly. OEMs just narrow the voltage range to extend life. When you set a charge limit, it narrows that range further.

[–] stealth_cookies@lemmy.ca 1 points 2 days ago

Something is off with the link's measurements. 3.7V is a li-ion cell's nominal voltage, not its lower limit. Typical operating range is 3.0V - 4.2V. No battery chemistry I'm familiar with would have a lower cutoff as high as 3.7V.

[–] xep@discuss.online 3 points 3 days ago (1 children)

You'll find that based on 3.7 - 4.2 that most li-ion batteries are indeed charged from 0-100 and not 20-80 as you previously claimed. Manufacturers have no reason to overprovision consumer products that are made to be replaced in 5 years or so.

[–] frongt@lemmy.zip 1 points 3 days ago* (last edited 3 days ago)

Yes, that's what I said. You could go higher and lower, and it would be reasonable to do for a short-life device, but they reduce it to extend the life. Mapping voltage to percentage is arbitrary.