How to Condition Your iPhone Battery
Just about the most important tips offered by users and experts alike would be to regulate the temperature when the iPhone operates. The lithium-ion (Li-ion) battery with the iPhone functions finest 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 (-20 to 45 degrees Celsius) but temperatures beyond these ranges is going to be detrimental to your iPhone battery. In other words, leaving your iPhone in a freezer or in a hot car is probably not advisable. Keep it out of sunshine as well. - battery
This next tip culled from forums and stuff like that is not so clear-cut. There are some who claim that allowing the iPhone battery to fully discharge more than once per month is not advisable, while others believe that no harm will come of it. What seems to have a consensus is that the iPhone battery has to be fully discharged from a full a discharge once a month in order to reset it meter.
It is also beneficial to have an idea of your actual usage plus your battery life in order that you can more fully understand your options. You can view your usage statistics inside the Settings Menu under the General Tab then Usage. You will observe Usage, which is the time that the iPhone was in active mode and that means you were on a call, watching a video, listening to music, browsing the web, and so on. It will also show your Standby time, which is total amount of time the iPhone continues to be running from its last full charge, whether in active mode or otherwise. Usage divided by Standby time provides you with a percentage of the time you're actively using your iPhone. The larger this percentage, the more often you will need to charge your iPhone, so plan accordingly.
Updating towards the latest official version of the software using iTunes may help you with taking care of the iPhone battery, but that is still up for grabs. Many folks complain that the update from 3 to 3.1 wreaked chaos on some applications. However, updates and patches should help improve the performance, so maybe that last one would be a bit of a fluke. At any rate, before updating your software, browse the forums to see exactly what the feedback is from individuals who have already updated their software.
As well as, the old standby of employing on the applications you'll need, turning off push, 3G and reducing the brightness of the display etc are still part and parcel of maintaining your iPhone battery in top condition for a longer period. Just because you've probably heard it before does not imply it doesn't work.
New things, though. Some users have seen that proximity with a cell tower (thus providing usage of a strong signal) extends battery life. This may be because network searching is delivered to a minimum. So try to stay in areas with an above average signal. A last and final tip is to apply your iPhone regularly, so that you massage the kinks out from the system and become knowledgeable about the peculiarities of your particular unit. After all, your phone is a highly personal gadget, and should be treated as a result. - battery