this post was submitted on 23 Sep 2024
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https://9to5mac.com/2023/11/21/iphone-battery-mah-capacity-list/
Generally-speaking, you can't improve a whole lot on capacity from a manufacturer's battery in the same space.
You definitely can't more-than-triple capacity.
On the other hand, there are a lot of sketchy people selling batteries with incorrect capacity claims out there.
I am all for large batteries, but doing so requires device manufacturers doing larger cases with space for larger batteries, not just dropping a replacement battery into the same space.
Follow-up to OP: If you do want that kind of large battery in a smartphone, you can get it. There are a few Chinese vendors that make "ruggedized" smartphones. For whatever reason, maybe because people want to be able to operate away from power, this class of device tends to have both a tough shell and large batteries; it was one of the few places I could find phones that had really huge batteries.
Doogee is one such manufacturer: here's one with a 10800 mAh battery -- I really wish that we'd use Wh ratings rather than mAh, but whatever -- and another from the same manufacturer with a 22,000 mAh battery. These are also quite large.
For the former phone:
Or 0.87 lbs.
For the latter phone:
But that gives some idea of the kind of the size tradeoff that you might need.