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Power Settings 
To reduce battery consumption, your system will go into the standby mode when it is idle for a certain period of time. Select > [Power Save Settings] > [Auto Standby], and then set the time.
Depending on the state of some applications, such as when a slideshow or a video is playing, the system may not automatically go into the standby mode.
Wi-Fi in Power Save Mode
Your system uses a power save mode to reduce battery consumption when connecting using Wi-Fi. To connect using Wi-Fi with the power save mode disabled, select the checkbox to remove the checkmark.
In some environments, the Wi-Fi connection with the access point might become unstable. In this case, disabling this function might improve the connection.
USB Power Supply
You can set whether or not to supply power to your system when it is connected to a USB device such as a computer using a USB cable.
If you select this checkbox to remove the checkmark, you cannot supply power to your system when it is connected to a USB device.
Battery Charging & Duration 
- Charging using the AC adaptor willl take approximately 2 hours, 40 minutes (for both models).
- Battery Duration
Add USB connector to PCH-1x00
- http://imaginglabo.web.fc2.com/PSvita-USB.htmb (in Japanese)
- http://www.instructables.com/id/PS-Vita-1000-to-microUSB-adapter/ (in English)
Power Management IC