Enabling STAMINA and Low Battery Mode:

1. From the home screen, tap the "Applications" icon
2. Tap "Settings"
3. Under "Device", tap "Power management"
4. Press the switches next to "STAMINA mode" and "Low battery mode" and set them to "ON"

Customizing how Battery Saving Mode Works:

1. Tap the "Applications" icon while on the home screen
2. Tap "Settings"
3. Under "Device", tap "Power management"
4. Perform one of the following:
   
   • To edit STAMINA mode:
     
     1. Tap "STAMINA mode"
     2. Tap the switch and set it to "ON"
     3. Tap "Activation"
     4. Drag the "Battery level" slider to adjust the battery percentage at which STAMINA mode enables itself
     5. Tap "OK"
     6. Optionally, add or remove applications under "Apps Active in Standby"
   • To edit Low Battery Mode:
     
     1. Tap "Low battery mode"
     2. Tap the switch associated with the feature, and set it to "On"
     3. Edit the settings for "Screen brightness" and "Screen timeout" as seen fit
     4. Mark or clear the check boxes next to "Bluetooth off", "Auto-sync off" etc, to determine whether or not these features are disabled during Low Battery Mode

Lowering the Screen Brightness and Timeout Duration:

1. Tap the "Applications" icon while viewing a home screen
2. Open "Settings"
3. Under "Device", tap "Display" > "Brightness"
4. Clear the check box next to "Adapt to lighting conditions"
5. Drag the "Brightness" slider to the left and tap "OK"
6. Tap "Sleep" > "15 seconds"

Disabling Bluetooth, Wi-Fi, GPS and Wi-Fi Hotspot:

It's highly recommended that you disable all connectivity features when they're not in use. Bluetooth, Wi-Fi and GPS can have a great impact on your phone's battery life, if enabled when not really in use.

1. While on a home screen, swipe the "Notification" bar down
2. Tap the "Wi-Fi", "Bluetooth" and "Location" (GPS) icons to disable these features
3. Tap the "Settings" icon located in the top-right corner
4. Swipe to "Wireless & Networks" and tap "More"
5. Touch "Tethering and Mobile HotSpot"
6. Clear the check box next to "Mobile HotSpot"

Reducing App Auto-Sync Settings:

1. Tap the "Apps" icon from the home screen
2. Tap "Settings"
3. Select the account that you wish to edit, under "Accounts"
4. Select the account name if necessary
5. Clear the check boxes associated with the various options, to reduce automatic sync

Disabling Background Data:

1. Launch the "Settings" menu
2. Tap "Data usage" under "Wireless & Networks"
3. Tap the "Menu" icon located in the top-right corner of the screen
4. Mark the check box next to "Restrict background data"

Minimizing the Use of Third Party Apps:

1. Tap the "Applications" icon from the home screen
2. Tap "Settings"
3. Under "Device", tap "Apps"
4. Swipe to the "Downloaded" screen
5. Select the desired app and tap "Disable", or "Uninstall" if you wish to completely remove the app
6. Tap "OK"

Switching from 4G to WCDMA:

1. Access the phone's "Settings" menu
2. Tap "More" under "wireless & networks"
3. Tap "Mobile networks" > "Network mode" > "WCDMA"

Applying the Most Recent Firmware Available:

NOTE: This trick gives results only if Sony has released a new software update that includes improvements to your phone's battery life. Otherwise, following the steps below will have no effect on your phone's battery performance.

1. Go to the phone's "Settings" menu
2. Tap "About phone" under "System"
3. Tap "Software update" and follow the on-screen prompts if an update is available