FSMdotCOM

ATTENTION: Also read HowTo: Get Battery Percentage on iPhone 2G/3G Running OS 3.0

• SSH into your iphone
• Go to /System/Library/CoreServices/Springboard.app/
• Download the file M68AP.plist
• Open the file using a text editor or a plist editor
• Add a Boolean value under the capabilities dictionary
• Boolean Key = gas-gauge-battery / Boolean Value = true
• Save and upload the file to the same directory that it was originally in
• Go onto the iPhone and respring
• Now go to the application Settings -> General -> Usage and there will be a Battery Percentage toggle and you can use it to enable battery percentage next to battery icon in top-right corner.

 props to wgm214

Also read:

• iPhone OS 3.0 Episode I: HowTo Enable Internet Tethering
• iPhone OS 3.0 Episode II: HowTo enable Video-Recording Interface on iPhone 2G/3G
• iPhone OS 3.0 Episode IV: HowTo Split iPod Into Music & Video or Vice-Versa
• HowTo: Enable Numeric Battery in iPhone FW 3.0

Related Stories On FSM:

1. iPhone OS 3.0 Episode IV: HowTo Split iPod Into Music & Video or Vice-Versa
2. iPhone OS 3.0 Episode II: HowTo enable Video-Recording Interface on iPhone 2G/3G
3. iPhone OS 3.0 Episode I: HowTo Enable Internet Tethering
4. HowTo: Enable Numeric Battery in iPhone FW 3.0
5. HowTo: Get Battery Percentage on iPhone 2G/3G Running OS 3.0
6. HowTo: Remove Lockscreen Date and Time on Your iPhone
7. HowTo: Use Promo Codes for iPhone Apps in iTunes
8. HowTo: Turn Your Notebook Battery Into Extra Battery Life For iPhone
9. HowTo: Downgrade From iPhone OS 3.0 to 2.2.1
10. Firmware 3.1 Beta 3: Found M68AP.plist Which Can Be Used To Enable iPhone 3Gs’s Features On Older iPhones