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Unfortunately, like the iPod, the iPhone 3G features a built-in battery that is not
intended to be user-replaceable. The iPhone's battery is stated to be
capable of providing up to seven hours of video, six hours of web browsing, or
eight hours of talk time (depending on configuration). Music playing is
stated to have a 24 hour life. The iPhone's battery will also allow for up
to 300 hours of standby time.
Below are the specs on the battery if of iPhone 3G:
- Built-in rechargeable lithium-ion battery
- Charging via USB to computer system or power adapter
Talk time:
- Up to 12 hours on 2G
- Up to 5 hours on 3G
- Standby time: Up to 300 hours
Internet use:
- Up to 5 hours on 3G
- Up to 9 hours on Wi-Fi
- Video playback: Up to 10 hours
- Audio playback: Up to 30 hours
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