Can someone tell me if you take your battery out of the 510 passthru, will it still work when hooked up to the usb? I ask because I am trying to figure out if my passthru is dead, or if I need a new battery. I took my battery out and still hooked up to the usb it wouldn't work. I kind of thought the battery was just for when you didnt have it plugged in. If it is the battery, does anyone know if you can get them at "regular" stores? Thanks in advance!