Why is my phone still having random shutdowns after new ifixit battery

So I’ve had a few batteries go bad but they were all within a week period.i would let them get below 10% and charge it back up and it would read 100% so I would unplug it and after 5 or so minutes it would shut off and I’d turn it back on and it would read 55% or so and then shut back off before you could unlock it then when I try to power it back on it gets past the google screen and almost boots you’ll hear it’s below 15% and then black screen and I have to let it charge for like an hour and a half before it will boot and the cycle repeats. I love this phone any help would be amazing