Alright, so my power source is the Apple Low-Power AC Adapter; I couldn't find anything online about the requirements for the PB180 but here's the specs of the power source:

Input: AC 100-240V

50/60Hz 31-40VA

Output: DC 7.5V 2.0A

These are the same ratings for the battery charger as well. Is this the power source I'm supposed to use? Or should I just refrain from using the power source directly altogether and use battery power exclusively?