I am buying a 10,000MAH power bank for my Sony xperia z5 premium and I need to know how to stick it to the back of the phone. I was thinking I would just glue it, But what if I need to take it off? How do I stick something securely to a surface without damaging it?
Buy a cheap phone case then glue it to the back of that. Use a strong plastic glue and a hard plastic (not silicone) case. That way you can remove it from the phone easily and it will be strong enough to resist everyday use.