Learn how to replace the battery and save battery life on the Apple iPhone 3GS. Find out more on this page:
Insert / remove battery
The iPhone battery is built into the device and cannot be removed.
If the device menus are frozen or unresponsive, you can soft reset using hardware keys. To perform a soft reset, follow these steps:
- Reset the iPhone by holding the sleep/wake button at the top right of the device and the home button at the bottom center of the face at the same time.
- Hold them both until you see the screen go black.
- Wait until the white Apple logo appears.
- When this happens, you can let go.
- The device will reboot.
Battery saving modeWe're sorry, this feature is not available for your device.
Battery saving mode settingsWe're sorry, this feature is not available for your device.
Tips to save battery life
To save and extend battery life, follow these steps:
- Lower screen brightness and backlight duration
To lower the screen brightness, go to Settings > Brightness & Wallpaper and adjust the slider. Alternately, you can select Auto-Brightness to brighten and dim the screen based on your current environment.
- Turn off Bluetooth, GPS, Wi-Fi, and Portable Wi-Fi hotspot when not in use. All of these features will frequently search for connections in the background while you aren’t using them. To turn these features on and off, go to Settings.
If Wi-Fi is available, use it: Using Wi-Fi not only saves your mobile data usage, it also can be a more power-efficient way to use data instead of using your mobile network.
- Change application sync settings
Keeping a constant feed from your social networks and e-mail accounts can cause your phone to be constantly interacting with the mobile network. Reducing the frequency that applications and e-mail accounts update can preserve battery life.
Turn off automatic synchronization and sync your e-mail and calendar manually. To change these settings go to Settings > Mail, Contacts, & Calendars > Fetch New Data, and tap Manually.
- Minimize use of third-party applications:
Using applications can enhance your phones functionality, but they can also use up valuable battery life – especially if they keep your screen on, or require a data connection. Some applications are best used when the device is plugged in.
Note: If you battery life decreases significantly in a short period of time – consider any recent downloads that may have started the problem, and uninstall them.
- Toggle from LTE to 4G (iPhone 5)
Our LTE network gives you faster data, but can also use more battery, especially if the LTE signal is weak. If you aren’t using data, leave your phone on 4G until you need it again. You will still be able to make and receive calls and browse the web at slower speeds while on 4G.
To change this setting, go to General > Cellular > Enable LTE and slide the toggle to Off.
- Toggle from 4G to 2G (iPhone 4S / 4 / 3GS)
Our 4G network gives you faster data, but can also use more battery, especially if the 4G signal is weak. If you aren’t using data, leave your phone on 2G until you need it again. You will still be able to make and receive calls and browse the web at slower speeds while on 2G.
To change this setting, go to General > Cellular > Enable 3G and slide the toggle to Off.
- Update to the Latest Software
Always make sure your device has the latest software version available. Apple will release updates to the device operating system, often improving battery life as one of the benefits.
To check for system updates go to General > Software Updates.
- Let it sleep
Be sure to put your phone into a sleep or standby mode when the device is in a pocket, case, or purse. Putting the device into sleep mode will keep you from unintentionally activating applications or illuminating the screen.
This is done by tapping the power key.
- Leave it plugged in
Your device should have a Lithium-based battery which means that leaving it on the charger will not damage the battery, even if it is already fully charged. Take advantage of AC power sources when they are available at home or at work for extended periods of time.
You should only use chargers that are approved by the manufacturer.