You can view battery status and charge percentage on the right side of the Notification bar. See here for how to charge your CM5.
Navigate to Settings > Battery to view an estimation of how long the battery has left until it needs charging and options for power management:
- Battery percentage: Toggle battery percentage display in the Notification bar on and off
- Adaptive brightness: Toggle this setting on to automatically optimise brightness level for available light.
- Sleep: Adjust the time before the terminal enters Sleep mode when idle
- Ambient display: Toggle this setting on to wake the screen when you receive new notifications