I've own my GR-DVL805U JVC camera since May 12th, 2000 and have not had any problems until this morning (Christmas 2004). What a disappointment I bought this JVC Digital DualCam on a recommendation that it was a good camera. Now because of a defect my wife and I have missed recording a moment in time which one can not recover. I've always used JVC products tapes to record on. But for some reason I too am getting this 'Unit in Safe Mode E04 Detach Battery' error. This is very unacceptable for a product to stop working. I store it inside and the tapes are not stored inside the unit. I use JVC Mini-DV 60/90 ME tapes.