Inescapably, trying to take pictures and film, whilst using modern technology to navigate and sometimes to entertain the residents of the trailer, all uses power. We take it for granted at home and yet when we're on the road, whilst not life-or-death, it does become a preoccupation when battery levels are running low. We are always on the lookout for the next socket, and rationing our usage to match our charging expectations. Depending on the circumstances, it swaps places with food in the hierarchy of needs!