Complex sentence: The dual BB-2590/U Li-ion rechargeable batteries allow for the robot to have a run time of 4 to 8 hours, and can maneuver in up to 3 feet of water.
Split into simpler sentences: The dual BB-2590/U Li-ion rechargeable batteries allow for the robot to have a run time of 4 to 8 hours. It can maneuver in up to 3 feet of water.