The Shark IQ Robot’s battery performance is remarkable. On its high-suction ‘Max’ mode, it yields over an hour of continuous runtime. On its more conservative ‘Eco’ mode, it can run for over 160 minutes, which should be more than enough to clean big rooms. Unfortunately, it takes over four hours to completely recharge, which is very long. The lights on top also clearly indicate the remaining battery life. When both lights are blue, the vacuum is at max battery capacity. At a partial charge, one of the lights will turn off. At low battery levels, one of the lights turns red.