The battery on mine is non replaceable. So it pretty much means the phone is done after the battery goes. I'm not a fan of having the phone tinkered with and ruining the original seal, even legit cell repair places can screw it up. They probably did that on purpose to encourage upgrading.
You can have Apple replace the battery for you for 79 bucks, if you don't have coverage or it is pass the 3 years.
https://support.apple.com/iphone/repair/battery-powerAre you 12 bro? You know you can install a new ROM. Running lineageOS
Not all android phones can be rooted and/or have roms for them. Plus sometimes it kills android pay,other features, and was bugs. Also have fun installing your shady rom downloaded for a shady google drive account. Smart people, that want android, will just buy google pixels or maybe onePlus phones and not worry about upgrade, updates, and malware pre installed on their phones. Have fun!