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I run my NEQ6 off three 7AH batteries wired to produce 21AH, and never have had a problem, but that's all I run off those batteries. The NEQ6 can use up to 2AH slewing, so my bank can last all night.
As far as dew heaters, dew heater controllers, and stuff like power hubs, etc I believe in using a second supply source. In the field I use a 40AH battery to power the 'other' equipment, including my camera power, heaters, etc.
Sit down and add up the watts required for each device you are using and work out the AH you need for as long as you want to run. Keep in mind that you don't want to discharge the batteries to deeply as it will shorten their life, eve deep cycle one. If you can add a Voltmetre to your battery box that can help watch the state of the battery. Don't let it run down below 12V ever, and for a good safety margin stop it once it gets to 12.3 - assuming it started at 12.8- 13.V.
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