After my 3GS now still does its job and I do not need a new smartphone it was time to swap the battery because it has not even more endured for half a day. So I had a choice, return phone or the Selbsversuch dare ... I have decided for the latter and the decision not bereucht! With the spare battery the right tool was to fix them and the exchange of the battery worked without any problems! Now the battery is finally back the full power and lasts me now about 1.5 days, which I think is a great value, as long as it has previously never held out! I can use the battery pack only recommend!
Many thanks to Amazon for the super fast delivery! 5-star more than deserved!