Smartbox Power Pad, User Manual

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As well as its internal battery, Power Pad has an external battery
which can be swapped without the device powering down.
Estimated battery life
The internal battery will last for approximately 3 hours (with eye gaze)
and the external battery will last approximately 6 hours (with eye
gaze). Total time: 9 hours
Charging time
The Power Pad’s internal battery will take approximately 2 hours to
fully charge. The external battery, when connected to the Power
Pad, will take up to 8 hours to fully charge. The batteries charge
simultaneously.
How the Power Pad batteries discharge
The Power Pad will always use the external battery before its internal
battery.
Viewing your remaining battery life
6.2 Getting the most from your battery
Battery cell Battery cell
(Charging)