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I went for the two pack of 600MaH ones, for a fiver. One battery seems to last 10 minutes so 3 in total will be enough for my basic flying. If you want another charger I think there is a pack of 5 batteries plus charged for £20.
I'd recommend 'modding' the camera so it doesn't point at the ground when it arrives by the way. It gives much better video!
Thanks Stew. Do you have a link mate?