I agreee , just peel the “position1” tabs. Plus my spare battery didn’t come with these tabs so I had to reuse the old ones anyway.

During reassembly this part was tricky for me: the new battery couldn’t clip into place the way the old one did, resulting in a loose connection and “battery does not match “ message when trying to power the phone up. The new battery probably had a slightly different connector that than the old one. I even ordered another battery but the same thing happened. I finally managed to connect it by applying much more pressure on the press connector than needed for the other ones. it did not make any clip sound though.