A:Answer Hi 1bigreddog, the Roomba i7+ offer "Smart Recharge and Resume". This means the Recharge and Resume time may be less than the full 85 minutes, with the Smart Map, the robots can understand what has already been cleaned, and what is still left to clean. As a result, the robot will only charge the battery enough to complete the current task. When it returns to the charging station at the end of the current job, it will perform a full recharge to be ready for the next job.