Drained both the second and main battery again last night as we misunderstood the instructions from the Auto Electrician - we finally had a switch put in the Kombi to isolate the second battery from the first so we could run the fridge might have to go back and see him tomorrow. a. Just how long will we get out of the second battery running the fridge? b. Does anyone use gas we are not keen on using gas at all. Some places we will be staying on our trek we will have power. What do others do please help!!!!!!!! Tony heads of on Wednesday... The fridge is an electrolux standard caravan fridge.