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hippy-
If it's useful for what you doing (and you mount it flat unlike the vid) then it could be cool, I don't really dig time lapse videos of cycling because a. one leans so much that the axis changes and I find it a bit nauseating and b. you might miss things that could come in handy if god forbid you need to use them in court/make a funny video of you falling over.
If you have the time/space/ability you can always create a time lapse in post.
IR
Well it just uses a single luthium cell so 3.7v afaik the standard one is 1600mAh, higher capacity shouldn't be too hard to find.
No reason you couldn't recharge any reasonably sized pack in a car with the cigarette lighter and the right attachment.