Yes - you can power it from an external source - a "power monkey" or ships power, rather than the battery if you want - there's a DC input jack socket on the right hand side of the unit. It's supplied with both a mains adapter and a 12v "cigarette lighter" adapter in the box.
Sternone - Do you actually own one? it's the AV80R not AV8ER, and I've had no problems with my unit - works flawlessly.