Pixel 7a. To be fair, it was a screen + battery replacement. The problem was the adhesive that they use. I warned it up, tried to open it and the screen shattered into tiny pieces when I tried to open it (because it was cracked).
I also don't have a heat gun, so I had to use a Ziploc bag with warm water.
Still though, they make it really hard
Did you pry with force? Or did the warm water make it lift easily?
I don't have experience with the ziploc method, but heat guns can melt solder so I'm wondering if temp was not high enough with the ziploc.
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Did the 7 and 8 have that much worse of a battery? I'm currently replacing the two Pixel 6 in my household (end of security updates), and there is nothing wrong with those. The hardware, battery included, is as good as new (or at least, not impeding our use).