3rd party battery compatibility with ios11/12

Hi all, I bought a second hand iphone 7plus which has an old battery that cannot hold a charge for more than 3 or so hours. I took it to apple to get the battery replaced but they -obviously- gave an excuse to refuse saying that the device had been opened before and they they cannot work on it (paid or not). Of course tried to get me to buy a new or refurbished phone from them.

I’ve heard some 3rd party components can be detected by ios (like the battery) and my question is, would an ifixit battery pose a danger to ios locking itself or something weird like was the case some time ago with the home button replacements?

Since I’m out of luck with the apple route, whats my best option not to lose my investment on the phone?