I did the hair dryer three or four times and applied all of the pressure i could on the suction cup and it just wouldn’t budge. My phone is old and i had a waterproof case on it for a long time that really pressed down on the glass so it would seal. I think having that on for three or more years really sealed the glass!!!! Didn’t want to break it so will live with my battery as is…..it last most of the day and i am usually around a car charger or home. Just thought i would add a comment that said man i gave it my best shot and opted not to do it. I really liked the kit though and the tool will come in pretty handy to repair other small things.