Battery Percentage meter option is officially available on iPhone 3GS only running firmware 3.0 and above; however, there is a small tweak available in Cydia which can enable this functionality natively on the original iPhone and iPhone 3G running firmware 3.0 and above. You will need to have a jailbroken iPhone for this to work.
There is no doubt about the fact that iPhone is one of the most popular cell phone out there. The argument for a longer battery life on the iPhone is relative in terms of its user requirement. If used as a cell phone, for the primary purpose that it has been designed for, the battery life would be fine and will last probably all day. However, if someone likes to use it as portable computer which I assume most iPhone users are doing, for checking email, web browsing, playing games etc, then the battery is comparable to that of any standard notebook at best.
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