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Healthiest way to charge Lithium Ion (self.technology)

submitted 1 month ago by root to c/technology

33 comments fedilink hide all child comments

When charging a phone wirelessly, there is sometimes significant heat generated. That combined with higher charging rates that are now coming out with the Qi 2 standard make me wonder what the ideal charge for the battery would be.

Most of the time I just toss my phone onto a wireless charger before bed, and don’t really care how quickly it charges. Would it be better to use a 5W brick with a charging pad? Should wireless be avoided and usb used instead?

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[–] NeoNachtwaechter 36 points 1 month ago (3 children)

The very healthiest way? But maybe you won't like it :)

Don't charge above 80%, don't discharge below 20%, charging current at 1/10 of the capacity, and always keep the thing at average room temperature.

[–] [email protected] 13 points 1 month ago* (last edited 1 month ago)

Don't charge above 80%, don't discharge below 20%

This how I keep my phones healthy for 4-5 years at a time. I only this year upgraded my Pixel 4a 5G to a 7a, and only because Graphene EOLd the 4a.

[–] Vinny_93 3 points 1 month ago (2 children)

My A52s has a built-in function to not let it charge above 80. I keep it on unless I need the extra 20% for instance when I'm away for a while.

[–] [email protected] 1 points 1 month ago (1 children)

Really? My girlfriend's A52 doesn't have this feature. That is part of why I bought my Xperia 5ii. Is it a new feature?

(After 3 years the battery is at 70% on mine because apparently Sony uses shitty as hell batteries and software drain glitches, while my girlfriend's A52 always charging to 100% lasts a day and a half with 3x the use, would not recommend)

[–] Vinny_93 1 points 1 month ago

Maybe it's only in the A52s, not the A52.

[–] [email protected] 1 points 1 month ago

Samsung Galaxy S24 has this too.

[–] root 2 points 1 month ago (1 children)

I was actually thinking of using the battery charge limit feature to prevent charging above 90%. Not sure I could do 80 without an charge during the day, lol

[–] [email protected] 7 points 1 month ago

Pragmatically speaking, for battery health you should charge only as much as you need the battery, so it sounds to me that in your case that's 90%. Also, here's a paper about battery charging:

Strategies to limit degradation and maximize Li-ion battery service lifetime - critical review and guidance for stakeholders https://deepblue.lib.umich.edu/bitstream/handle/2027.42/154859/Woody_Maxwell_Thesis.pdf