On My iPhone 3GS started with iOS 4.3 and 5.0 did not improve even with the 5.0.1. When started, the device shut down at around 43% battery. Every 2 or 3 weeks the problem got worse ... 53%, 65%, 75%, 86%, 96%, 98% and 100% now it can be turned off.
I realized that if I use the internet through the 3G off at around 98%. If you use the internet through wi-fi, off at around 86%. If you use 3D games off even faster. The first shutdown can be restored by resetting the system (home + power). But after the second or third, it asks to connect to an electrical outlet, the battery even when it was full. If you make a small charge, enough to start the system will turn off at the next mark (percentages cited above). I started using the iPhone always connected to an electrical outlet (house or car).
Recently I made a painful test: I turned off the 3G, wifi and data transmission; stopped to use all the features of the iPhone, except for calls and SMS. The GPS was on, but I did not use any application that needed it. As a result, the battery lasted about 4 days and declined up to 6% (when it fell during a call). I was very glad to review the battery alerts (20% and 10%) after so many months. Then I waited 1 or 2 hours and recharged the phone to 100%. I noticed that charging was much slower than what was occurring before (and remains so since then). But until now I did not notice a difference in the problem.
Other users with the same problem say revert to factory settings did not fix the problem. There are no Apple Stores in my country, only representatives and mobile phone carriers, but the assurance of my iPhone expired in May 2011, in addition, here we have the iPhone 4S world's most expensive (between US$ 1419 and US $ 1,855), the which means buying another iPhone is a last option. Buy another battery would be easier, but I question: if the problem is the battery, why work properly when does not was required 3G, Internet, games or gps?
It would be nice if Apple responded something like "we are aware of the problem and are working on it." At least we could hope to keep until the next update.
Here are some of the topics of people with the (same / similar) problems:
- https://discussions.apple.com/thread/3352523?answerId=16862278022#16862278022
- https://discussions.apple.com/thread/3412435?answerId=17076909022#17076909022
- https://discussions.apple.com/thread/3071209?answerId=17169026022#17169026022