you probably don't have a problem with the energy itself, just the frequency these robo-girls come in. I limited myself to one camera and hearing to save some energy. I calculated that the minimum to go through the first hour is 11%~ energy, i.e. 6 hours=66%, so you still have 44% left in stock, plus there is a foxie that takes about 7-10% of energy for three full hits. there is no argorithm for fredie,sorry:<