You may want to consider this from a different angle. Once you get much above 3 or 4 you should really be thinking about recharging whilst you fly, You can do this from a vehicle of course if necessary. I wouldnt go out and buy 10 batteries just so you can film for two hours.
The problem you'll run into charging in the field is the cool down period. Still going to need at least 6 maybe more. 20 minutes on, 30 minute at least cool down before it'll will accept another charge.
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