Battery replacement: DIY plans, and question on the bigger capacity batteries on sale on amazon.

Hello, I’m planning to replace my own battery. Brought it to the service center today, they went too keen as I have a line across my screen (crack). It’s kind of absurd how much they’re charging in case the screen breaks. I’m raw dogging it.

Due to my previous work requirements, I have some experiences opening up Xiaomi Mi Max and Samsung S9+ front and back cameras but never had I actually needed to replace a battery. I’m seeing on amazon that there is Iphone 13 pro max batteries rated up to 13500 mAh. The current iphone cap is 4-5k plus iirc. That’s an extremely compelling choice since I’m doing it anyway.

I was wondering on the opinions of the others on buying that instead. I guess one question I have at the back of my head is will my sensor be accurate? Battery percentages.

By the way, buying a replacement screen, just in case my screen breaks too, any tips for both, please?:) especially for Repair, which areas I really need to be careful.