You can power your BCD325P2 using two alkaline or rechargeable AA batteries
The USB cable can also power the scanner when the batteries are removed.
Power Requirements:
2 x AA size rechargeable Ni-MH batteries (2300mAh - Included)
2 x AA size Alkaline batteries (Not included)
DC5.0V ± 5% Connect to PC with mini USB cable (included)
all from the manual