Hi Chompiri, welcome to the community!
The following tips can help you improve the battery performance:
- Charge your phone frequently. This will not affect the lifetime of the battery.
- Downloading data from the Internet is power consuming. When you're not using the Internet, you can save power by disabling all data connections over mobile networks. You can do this from Settings > Wireless & networks > Mobile networks > Data enabled. This setting does not prevent your phone from transmitting data over other wireless networks.
- Turn off GPS, Bluetooth® and Wi-Fi® when you don't need these features. You can turn them on and off more easily by adding the Quick settings widget to your Home screen.
- Use the STAMINA mode and Low battery mode features to reduce battery consumption. You can select the power saving mode that best suits the way you use your device. You can also customise the settings of each power saving mode.
- Note! The STAMINA mode and Low battery mode features are available from Android™ 4.1 and later. Some products using Android™ 4.0, or which were updated from Android™ 4.0 to later versions have Extended Standby Mode. It is also a feature that reduces battery consumption.
- Set your synchronization applications (used to synchronize your email, calendar and contacts) to synchronize manually. You can also synchronize automatically, but increase the synchronization intervals.
- Check the battery usage menu in the phone to see which applications use the most power. Your battery consumes more power when you use video and music streaming applications, such as YouTube™. Some Android Market™ applications also consume more power.
- Lower the screen display brightness level.
- Turn off your phone or use Airplane mode if you are in an area with no network coverage. Otherwise, your phone repeatedly scans for available networks, and this consumes power.
- Use a Sony original handsfree device to listen to music. Handsfree devices demand less battery power than the phone's loudspeakers.
- Keep your phone in standby whenever possible. Standby time refers to the time during which the phone is connected to the network and is not being used.
- Areas with poor reception or signal strength increase the drain on the battery and shorten talk and standby times. Operating the phone for a significant amount of time in areas with poor signal strength results in less than optimum battery performance.
- Do you roam often? Or use the handset in low signal areas often? Roaming causes the phone to scan for the consumer's home network, putting additional demands on the battery while low signal strength being displayed on the phone means that the phone must transmit at a higher output power to reach the cell tower again, putting additional demands on the battery.
- Switch to a wallpaper that is not a Live wallpaper if you're using one.
- Perform a repair/update of your Xperia™ device
- Reset the Xperia™ device to its original settings by performing a factory data reset.
- As a last resort, contact a Sony Mobile repair partner. Bring proper documentation, for example, proof of purchase and warranty card. The documentation required may vary depending on market, country or region. The repair partner can perform diagnostics on your device and inform you about possible solutions.
