Chosen Solution

I have removed both screws, but the back panel will not slide up. I’ve tried increasing pressure, cleaning the sides with alcohol and increasing grip with some gaffer tape. I can’t replace the battery if I can’t open it. What am I doing wrong?

The battery is probably expanding and putting pressure on the back glass making it harder to slide up. I would try putting the phone face down on a non slip surface like a rubber mat or something then slide the back up while putting slight downward pressure on the phone.