The official line from Apple is that iOS 4 can be trusted to properly manage background functions and minimize or eliminate battery drain. Most apps on the app switching dock are not using system resources even though they have been recently used. Some are in a suspended state and can be quickly restarted from the app switching dock.
Submitted by Bob Bhatnagar on
Some unlucky iPhone users got the short end of the battery life after updating to iOS 4.1. Users have reported battery life issues among other problems with prior firmware updates (remember iPhone OS 3.1?) but now some running iOS 4.1 are seeing their battery percentage drop to zero within hours.
Online discussion forums are hopping with activity from iPhone 4 and iPhone 3GS users complaining of shortened battery life and warm phones running iOS 4.1. Some reports have suggested that errant processes are running in the background constantly and draining the battery power. Bugs in the modem firmware, tethering software, and Game Center have all been cited as possible causes of the issue.
Yes. The iPad charger is a high-power version of the iPhone charger, however it's completely safe to use with the iPhone.
The iPhone will only take as much power as it needs and will not be overloaded. The iPad 10W USB power adapter will charge the iPhone or iPad batteries correctly and efficiently.
There are several things you can do to improve your iPhone's battery life. Considering the recent issues many 3GS owners are experiencing with firmware updates 3.1 and later, these tips are important to those who don't want to charge their iPhone twice a day.
1. Turn off 3G when you don't need it for data. This actually has the added benefit of improving voice call quality for some users. Settings -> General -> Network -> Enable 3G -> OFF
2. Turn off Wi-Fi when you don't need it. Settings -> General -> Network -> Wi-Fi -> OFF
Submitted by Thomas Estilow on
Well it didn't take long to hear from iPhone owners who tried the 3.1.3 firmware update to fix their existing battery problems. Some people are reporting the same problems, if not worse after updating to 3.1.3 from 3.1.2 or earlier iPhone OS versions.
Previously, many users updated to 3.1 software so they could take advantage of MMS functionality on AT&T and found that an unwelcome side effect was shortened battery life on the iPhone 3GS. (Learn how to turn on MMS without updating your 3.0 firmware here. Some have speculated this has something to do with the iPhone losing and acquiring the 3G signal repeatedly which drains the battery.
