I recently bought the JVC GZ-MG50 hard-drive camcorder which uses the same BN-VF range of batteries. Balking at the price of the JVC proprietary batteries (and the fact that the 733 isn't available in the UK yet) I took the risk and ordered 2 different BN-VF707 non-propriety models and a BN-VF733 copy.
Unfortunately none of these are recognised as data batteries by the camcorder.
My question is whether anyone knows of a way to circumvent this feature - I'd rather not know exactly how much time I have left and save £70! At present the camcorder will not even power up if one of these batteries is attached.
If there isn't a way around this, then I have 3 x BN-VF707 and 1 x BN-VF733 non-JVC batteries for sale to any JVC camcorder owner who doesn't have a camcorder with the data battery function.
On a positive note I've found the genuine JVC batteries online for about 75% of the JVC price, but this is still high compared to the eBay prices