One of the most important tips provided by users and experts alike is to regulate the temperature when the iPhone operates. The lithium-ion (Li-ion) battery with the iPhone functions best in temperatures ranging from 32 to 95 degrees, or 0 to 35 degrees Celsius. At its extremities, the iPhone can continue to function between -4 and 113 degrees Fahrenheit (-20 to 45 degrees Celsius) but temperatures beyond these ranges will be detrimental to your iPhone battery. Quite simply, leaving your iPhone inside a freezer or in a warm car is probably not recommended. Keep it out of sunlight as well.- android
This next tip culled from forums and stuff like that is not so clear-cut. There are several who claim that allowing the iPhone battery to totally discharge more than once per month is not advisable, although some believe that no harm will come of it. What seems to have a consensus would be that the iPhone battery must be fully discharged from a full a discharge once per month in order to reset it meter.
It is also beneficial to have an idea of your actual usage as well as your battery life in order that you can more fully understand your options. You can view your usage statistics in the Settings Menu beneath the General Tab then Usage. You will see Usage, which is the time how the iPhone was in active mode which means you were on a call, watching videos, listening to music, browsing the net, and so on. It will also show your Standby time, the total amount of time the iPhone continues to be running from its last full charge, whether in active mode or not. Usage divided by Standby time provides you with a percentage of the time you had been actively using your iPhone. The bigger this percentage, the more often you will need to charge your iPhone, so plan accordingly.
Updating for the latest official form of the software using iTunes may help you with taking care of the iPhone battery, but that's still up for grabs. Some users complain that the update from three to 3.1 wreaked damage to some applications. However, updates and patches are supposed to help improve the performance, so perhaps that last one was a bit of a fluke. At any rate, before updating your software, check out the forums to see what are the feedback is from those who have already updated their software.
And of course, the old standby of utilizing on the applications you need, turning off push, 3G and decreasing the brightness of the display etc are still part and parcel of keeping the iPhone battery in good health for a longer period. Just because you've probably heard it before does not imply it doesn't work.
Something new, though. Some users have seen that proximity to some cell tower (thus providing usage of a strong signal) extends it life. This may be because network searching is brought to a minimum. So make an effort to stay in areas with a good signal. A last and final tip is to use your iPhone regularly, so you massage the kinks from the system and become knowledgeable about the peculiarities of your particular unit. After all, your phone is really a highly personal gadget, and may be treated as a result.- android