Charging and power modes
It takes

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Connect the appropriate international plug adapter for your region to the AC adapter.
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Connect the power cord to the charging port on the device.
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Plug the power supply into an electrical outlet.

You can check the battery level:
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on the Lock screen. When you wake the device, the battery status appears in the lower-right corner of the Lock screen.
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on the Desktop taskbar. The battery status appears on the right side of the taskbar. Tap the battery icon for information about the charging and battery status, including the charge percent remaining.
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on the battery. Press the button on the battery to check the battery charge level. You can check the charge level of the battery in this way when the battery is inserted in the device, or when it is not.
The LEDs on the battery will show one of the following:
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= No LEDs are lit: < 4 %
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= 25 %
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= 50 %
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= 75 %
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= All LEDs are lit: 100 %
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The charging status is shown with an LED on the front top left corner of the display.
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☀ Red: charging error. It can take the device approximately 30 seconds to recognize a bad battery and indicate a charging error.
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☀ Orange: TSC7 controller / Ranger 7 data collector is charging.
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☀ Green: TSC7 controller / Ranger 7 data collector is fully charged.
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☀ Green - Flashing: TSC7 controller / Ranger 7 data collector is in Sleep state.

To turn on the device, press the Power key. The

To save battery power, set the screen to turn off when you haven't used it for a length of time. This state enables the device to resume quickly when you want to start working again.
To further save battery power, set the device to go into Sleep state when you haven't used it for a length of time. Sleep state saves your work and turns off the device. When you start up the device again, you are back where you left off.
To set the screen turn-off time and the Sleep state time, go to Settings / System / Power & sleep.

To wake the screen when it has turned off, press any key or swipe the screen.
To wake your device from Sleep state, press any key. After waking your device, to unlock it:
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Swipe up from the bottom edge of the screen or press a key.
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At the sign-in screen, enter your password or PIN.

To restart your device, tap Start/ Power / Restart.

To turn off the device, tap Start / Power / Shut down.
For information on customizing power management features, see Power options.

The operating system comes with pre-defined power options (Balanced, Power Saver, and High Performance). To access Power Options:
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On the Desktop, tap the Battery icon in the Notifications bar at the bottom right of the screen, then tap Power & sleep settings.
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Make sure Power & sleep is selected in the list on the left, then under Related settings, tap Additional power settings.
By default, the device is in Balanced mode.