For the current supply of the terminal the Lithium-Ion battery HA-G20BAT is used. A rechargeable, not exchangeable by the user, backup battery secures the main memory if the capacity of the main battery is low or during the change of the main battery. The backup battery is charged by the main battery.

Battery	Capacity	Weight	Charging Time	Running Time
Main Battery (7.4V)	2,000 mAh	107g	5 Hours	8 - 13 Hours
Backup Battery	25 mAh	-	1.5 Days	10 Minutes

Further information, especially about calculating the running time can be found in the Hardware Manual.