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Am I crazy or is it possible to get dramatically better battery life for most phones by immediately going and replacing the battery?

My current iphone is rather old, the charging port barely works and the battery doesn't last more than 60 minutes of actual use. So I was looking at new models and was thinking to get a used one, but battery was the biggest concern... Seems I've found out getting a used one with a shitty replaceable battery is almost preferred.

Am I crazy or is it possible to get dramatically better battery life for most phones by immediately going and replacing the battery? My current iphone is rather old, the charging port barely works and the battery doesn't last more than 60 minutes of actual use. So I was looking at new models and was thinking to get a used one, but battery was the biggest concern... Seems I've found out getting a used one with a shitty replaceable battery is almost preferred.

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[–] • 2 pts

(I run engineering R&D teams developing battery powered products ... )

For a given battery volume and chemistry, there is only so much theoretical capacity.

Apple (and others) tend to put pretty high quality batteries in their product. (Relatively speaking.)

3rd party (Chinese) vendors LOVE to make up BS specs for unsuspecting consumers. You are very likely being lied to about the battery capacity.

I've seen advertisements for batteries claiming 10X the theoretical limits of capacity. Damn liars. (As a parallel, we see the same garbage in speakers and amplifiers because most consumers don't have good ways to measure the performance.)

The only major exception to this rule (where it is possible to get "a better battery" with a replacement) is when a mfg designs the battery case with extra space. This is so that they can go back and sell a "XL" battery that uses up the extra space. (This used to be very popular in laptop designs, but not so much these days.)

So: Yes - replace your battery. Yes - it will work better than your broken battery. But, no - don't expect it to work as well as the original battery worked when you first bought the phone.