Yes, pump can work using just a battery. 


Type:

EVE26500M

R14, 'C', or Baby Size

6500 mAh

or SAFT LSH 14


Typical operating time (with a new battery) is up to 48 hours at 1.0 μL/min and up to 24 hours at 10 μL/min. For longer operating time, change of battery is necessary or operation with power supply of manufacturer Egston, type - E2CFMW3 12 with 5V, 1500mA is recommended.