The feature to show the battery percentage is a new feature provided by Apple in the firmware 3.0 and only for the iPhone 3GS.

To activate this service on iPhone 3G, follow these steps:
Open Cydia> Manage> Sources> add this source: http://apt.iphone-storage.de
 

Then search for asBattery and install it.

Then lock the phone and unlock it, and you will find that the feature has been activated in the phone settings under Usage in General.

To activate the feature:
Go to Settings> General> Usage> Turn Battery Percentage ON.

To close the property:
Go to Settings> General> Usage> Turn Battery Percentage OFF.

 

 

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