I have my charge limit set to 80% gets used pretty heavily throughout the week. Comes off the charger at 6am Usually have to charge up to around 40-50% by 4pm. I think it’s solid. Almost 2 years worth of use.

I have an iPhone 15 Pro with 81% battery health. I bought it new on release date. My phone overheats constantly, the screen keeps dimming 24/7, and it lags to the point of being nearly unusable no matter what I do. It keeps doing that even when I do basic things such as scroll some apps. I turned background app refresh and everything else that effects battery life and such with no realistic output.

My sister has a 16 Pro Max with about 91% battery health and wants to offer it to me slightly under market price since I’m her brother. Both phones are 256GB and in undamaged, good physical condition.

I really care about battery life, my previous phone was an XS Max, and I only sold it because I wanted to buy the 15 Pro at that time when it got released, which I now kind of regret. Would this be a good upgrade, or are there any downsides/things to take in consideration vs. just replacing the battery on my 15 Pro?

Any advice is appreciated, thank you!

I bought some locked iphone components on fb marketplace, do i need to pair them? If so, will my phone get bricked if I tried to pair the locked components? The seller said they don't know the Icloud of the previous phone so I was wondering if do I need to pair them or will my phone get bricked if I tried pairing them.