51.   The most powerful laptop computer or the most stylish cell phone is useless unless its battery pack can deliver a long-lasting stream of power.

52.   The more experimental models in the race are far more fuel efficient, using big electric motors and small gasoline engines to gradually recharge a battery pack.

53.   The picture signal was sent from the battery pack to a small satellite dish located in the Jacobs Field press box.

54.   The patient can thus remain mobile and productive, hampered only by the need to wear a battery pack to recharge the internal battery.

55.   Therefore, most small solar-powered equipment also includes a battery pack and a hand-cranked dynamo to provide backup power.

56.   There are light-up battery packs, solar battery packs and battery packs with figures like cartoon characters or animals whose eyes blink.

57.   This heavy-duty product, designed for professional tradesmen, functions as both a radio and a charger, which can recharge the entire line of DeWalt battery packs.

58.   They planted two microphones at the top of the walls and put log-sized battery packs above the ceiling.

59.   This means the electric motor and the battery pack can be kept small.

60.   To address the pollution problem, they have set up recycling centers throughout the country so users can dispose of the spent battery packs safely.