this post was submitted on 09 Nov 2025
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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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[–] MurrayL@lemmy.world 36 points 3 days ago (3 children)

Non-magnetically-aligned wireless chargers are far worse than fast charging.

[–] aBundleOfFerrets@sh.itjust.works 28 points 3 days ago (1 children)

Far worse at what? Wasting energy? That isn’t what the video is testing.

[–] MurrayL@lemmy.world 43 points 3 days ago (3 children)

At killing batteries faster - the wasted energy creates heat, which degrades the battery.

[–] chocrates@piefed.world 21 points 3 days ago

That makes sense but has it actually been tested?

[–] Anivia@feddit.org 12 points 3 days ago (1 children)

But keep in mind the phone will throttle charging speeds when it gets warm, so the battery doesn't end up getting much warmer, it just takes forever to get a full charge (especially when using a thick case that puts further space between the charging coils and also acts as thermal insulation, thus reduces the phones ability to cool down)

It is still keeping the battery warmer which degrades it faster regardless if its being charged or not.

[–] ColeSloth@discuss.tchncs.de 3 points 3 days ago

They tested that too, actually. Heat, I mean. It's in a different one of the channels videos. It's easy to find, since the channel only has like 10 videos and only a few are about phones .

[–] KingOfSuede@lemmy.world 5 points 3 days ago (1 children)
[–] warm@kbin.earth 7 points 3 days ago (1 children)
[–] iopq@lemmy.world 1 points 3 days ago (1 children)

It's literally a few watt hours. Not kilowatt hours, watt hours. I pay $0.08 per kwh, so after a few years of wireless charging I might pay $1 more

But the USB-C cord might break in less than that time and cost more. Manufacturing cords is never going to be green, but electricity can be made renewable

[–] warm@kbin.earth 1 points 3 days ago (1 children)

The charging pad might also break and they require cables themselves, plus all the materials to make the charging pad, plus every phone has to support wireless, which is even more materials. I've never broken a USB-C cable, that's a user issue, you are either being way too aggressive with them, buying low quality ones, or both.

[–] iopq@lemmy.world 1 points 2 days ago (1 children)

You keep on connecting and reconnecting the USB-C cable, and if you use it while charging you probably bend it.

The cable in the charging pad never gets unplugged

[–] warm@kbin.earth 1 points 2 days ago (1 children)

You can't use a wireless charger while in bed. Unless it's magnetic, then it's also got the bending risk.

I lay in bed all the time with my phone charging, the cable bends, but I'm aware of it, it's never broken. I've had this specific one for 4 years now.

What if I want to charge in a different room? Do I buy another wireless charger? That's more cost and material again versus just a cable. Do I unplug the charger and take it with me? Cables just make way more sense. Your phone is tethered to something either way, might as well do it the more efficient and green way and plug a cable in.

[–] iopq@lemmy.world 1 points 2 days ago

If you yank a magnetic stick on charger it just disconnects. If you yank a wired cord it can break it.

I never said you must stop using wired charging. If you're using it while charging and it works for you, you can continue to do that.