Barry,
Remind you one thing, if you really want to take DV when winnie give birth, pls remember don't switch on the DV when you enter the delivery suite until you want to do so.
Tell you one thing, my friend also wanted to take DV when her wife gave birth and then he switched on the machine and then accompanied with his wife to delivery suite and his wife pained for over 3 hr and then the baby was come out and my friend wanted to take the DV and he found there is no battery, finally, his wife