A lightning ground strike temporarily knocked out the unit’s hi/lo surge protector causing the RV to revert to its internal 12V system. As the battery power wound down, the auto switching feature on the refrigerator quit and the the AC quit. By the time 110V power was restored, the battery was drained. I had no 12V system lights, no AC, and the fridge was displaying a check system warning. I switched out deepcycle batteries and everything restored to normal. Had I left the drained battery in place, would the onboard charger have eventually brought the system back to full function?