if the error is actually "communicating error"...
See page 16.
What happens when you use the old battery?
I have a JVC GZ-MG20U that is giving me "communication error" when I turn it on then it shuts itself off. JVC's dismal support site show nothing when I search the FAQ's. I have a new battery in it too. PLEASE HELP I need this camera for my wedding and I cant afford another one. Thanks everyone for reading this.