I run mine on the exact same battery and cable as my UA5 ran on. Have not had time to do an exhaustive battery life test, but I've had no problems at any shows running 24/96 for the opener and main act. Probably 2.5-3 hours total. The WalMary DVD battery still had 3 of 4 LEDs lit when I was done....... There was a thread somewhere about R-4 battery life, but it was pretty long and a bit tricky to follow as I remember.