Ever wondered how long would an iPhone 4 or iPad battery would last you?
Update: I have added battery specs of the new iPod touch at the bottom.
Here is one of many apps that can help you determine how many hours your iOS device can run.
Activity Monitor Touch (+ App for $1.99)
iPhone 4 Battery Life
@100% Charge:
Talk over 2G network: 14 hours
WiFi: 10 hours
Talk Over 3G network: 6 hours
Audio Playback: 40 hours
Video Playback: 10 hours
Books reading: 10 hours
Games: 8 hours
FaceTime: 6 hours
Standby: 300 hours
iPad Battery Life
@100% Charge:
Standby: 720 hours
WiFi: 10 hours
3G network: 9 hours
Audio Playback: 10 hours
Video Playback: 10 hours
Books reading: 11 hours
Games: 10 hours
iPod touch Battery Life
@100% Charge:
Standby: 300 hours
WiFi: 10 hours
FaceTime: 6 hours
Audio Playback: 40 hours
Video Playback: 10 hours
Books reading: 10 hours
Games: 8 hours