i took my iphone on 4feb. after charge 8hrs, i tried heavy usage with all enable (3G, push, hevy youtube, surfing, gaming). iphone only stand for almost 2hours.

then everything get worst. after full charge, with anything disable (contra with above); hold only 5hours like that.

last saturday i try BatteryDoctor app, and wow... it's powerful. come with Last Full Cycle Charge... from 10 am till 4pm only down 10% (remain 90%); with heavy sms, light surfing & YM.

so, Last Full Cycle Charge is what ur iphone need. @_@

ehehhehe

This post has been edited by xdsl: Feb 8 2010, 04:25 PM

there are many apps offer Full Cycle Charge; the most popular is Battery Doctor.

For me, Yes it's improve my battery life with "Full Cycle Charge". and it's help me to manage my iphone's battery very well.

try it. only $0.99usd. approximately RM 3.50...

from apple's site :

Use iPhone Regularly
For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Be sure to go through at least one charge cycle per month (charging the battery to 100% and then completely running it down).
http://www.apple.com/batteries/iphone.html

What is Full Charge Cycle :
A charge cycle means using all of the battery’s power, but that doesn’t necessarily mean a single charge. For instance, you could listen to your iPod for a few hours one day, using half its power, and then recharge it fully. If you did the same thing the next day, it would count as one charge cycle, not two, so you may take several days to complete a cycle. Each time you complete a charge cycle, it diminishes battery capacity slightly, but you can put notebook, iPod, and iPhone batteries through many charge cycles before they will only hold 80% of original battery capacity. As with other rechargeable batteries, you may eventually need to replace your battery.
http://www.apple.com/batteries/