We have two Group 27 batteries in our FW, Jayco HT 26.5 RLS, and just went to Grand Teton for six days. Batteries indicator still said 2/3 charge on the fourth day when we turned the generator on to watch a movie. We don't use the FW much during the day, usually fish or sightsee all day, so minimal use and not a lot of lights on during the evening. Have power to the radio, CO/propane detectors, the frig and used the furnace at night as the temps got a little cool. We used to camp in a 1993 Jayco 215SD and could get between four and five days out of one battery as long as it didn't get too cool at night. Did have the battery get too discharged to fire up the furnace once or twice so we would switch out with the extra one we brought.
