10 - 30 Minuten
The iPhone 4S battery would randomly shut off between 20%-30%. Plug it in and it would start charging at the percent when it shut down. Diagnostic & Usage Data would say list the crash as battery related.
The antenna reception seemed to be spotty with wifi and the cellular service.
The replacement of both the antenna and battery were very simple. With the use of tweezers and a magnet (strike the screwdriver alongside the magnet to help hold the srew) the installation of the very small screws was a lot easier.
The battery is holding its charge longer and the reception and clarity are a lot better.
Go slow, take your time, and use the supplied tools that come with the battery kit.