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lineout,
have you worked out what your total power requirements are for your setup is? (your mount power requirements, cameras, dew heaters, laptop, gadgets etc?). Your mount alone may need 20 or 30 Watts.
This will give you an idea of how long your battery will last for your setup. It is possible to assemble your own battery pack but you need to be careful with the type of battery you choose, safety features, connections etc (batteries connected in parallel). Ordinary car batteries are usually designed for high current starts of engines etc and aren't deep cycle. They also have thinner plates. Deep cycle or deep discharge batteries are preferable (and expensive).
cheers
Peter
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