Popped into Supercheap and went for one of these:
http://www.supercheapauto.com.au/onl...d=283448#Cross
1900 amp peak. 38 ah (2 X 19 ah sealed batteries). 2 x 12 v outlets, and it jump starts the car as well! On special for $129.
Also got a 12v-19v converter for the laptop from Jaycar (extra $60). Bench tested last night, it ran laptop for over 4 hours very easily.
Going to run the mount and laptop tonight for a test run in the backyard.
Clear skies
Rod
