You won't have to use hot air if you go with a phone with replaceable battery. They are fewer these days, but they still exist: https://www.productchart.com/s

You won't have to use hot air if you go with a phone with replaceable battery. They are fewer these days, but they still exist: https://www.productchart.com/smartphones/sets/3 https://www.productchart.com/smartphones/sets/3