this post was submitted on 04 Jul 2025
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[–] Botzo@lemmy.world 53 points 2 days ago (12 children)

Anti-clickbait title: the US federal regulation limiting cell phone battery capacity.

If you want to skip the click through: 20Wh maximum

https://www.ecfr.gov/current/title-49/subtitle-B/chapter-I/subchapter-C/part-173/subpart-E/section-173.185

[–] xodoh74984@lemmy.world 17 points 2 days ago* (last edited 2 days ago) (3 children)

Thanks for this. Another important bit:
5,000mAh × 3.88V ÷ 1,000 ≈ 19.4Wh

[–] InnerScientist@lemmy.world 7 points 1 day ago* (last edited 1 day ago) (2 children)

The Watt-hour (Wh) rating may not exceed 20 Wh for a lithium ion cell or 100 Wh for a lithium ion battery.

The difference between cells and batteries is that you have to have multiple lithium cells to make a battery.

Edit: this is around 25000 mAh

[–] ms_lane@lemmy.world 1 points 9 hours ago

I'm guessing a pouch cell counts as 'one cell' vs. a larger battery pack with multiple cylindrical cells.

It also explains why Apple does that weird thing with 4-5 batteries in a macbook...

[–] pirat@lemmy.world 1 points 21 hours ago

Does this mean the US doesn't have powerbanks with e.g. 30000 mAh capacity?

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