41.   Was the battery charged?

42.   Braking also helps keep the battery charged.

43.   It has a wearable battery pack that transmits power through the skin to charge internal batteries.

44.   It surfaces to get fresh air to run its diesel engines and charge the batteries that power its electric engines underwater.

45.   The batteries can be charged at ordinary power outlets.

46.   The hybrid never needs recharging because the gasoline engine charges the battery while the car runs.

47.   The wheels are turning the motor, which in turn is charging the battery.