I also have the Neq6, I went down the AGM deep cycle battery path and got all the other bits and pieces from Jaycar. I put the battery into a tradie type lunch bag that had a plastic ice box lining.
The 35ah runs both my mount, laptop, red light all night no problem. The Full river range allows you to discharge the batter by up to 80% before it cuts out, so keep this in mind some cheaper ones only allow you to only utilize 65 -70% before the cut off. So to much power is better than not enough.!
Also keep in mind spend a little extra and get a 4 stage charger so that you can leave the battery connected constantly in a ready stand by mode.
Here is my Rig. http://imageshack.com/a/img812/6297/55d9.jpg
http://www.allpurposebatteries.com.a...products_id=31
http://www.allpurposebatteries.com.a...roducts_id=121
http://www.jaycar.com.au/productView.asp?ID=PP2007