20 - 30 Minuten
My Battery was totally open. Maximum length was 5 hours..so I needed a new one!
It was totally easy. At first I was kind of afraid but it worked, was really easy and the tutorial was super! thanks for that! needed just 20 min to change it and I'm happy, as well as my iPhone :)
not really, just read the tutorial carefully 1 or 2 times before starting :)