Using a dedicated high-current electric circuit, like those installed for electric ovens, these can recharge the MINI E in 4.5 hours. (With an ordinary mains socket, by contrast, recharging could take all day.) For cars with smaller battery packs, like the Smart, overnight recharging from a conventional socket is possible.

ECONOMIST: Rational consumer

Its long battery life is designed for a full work shift without the need for recharging or docking, while its combination of bridge battery and optional lightweight battery offers professionals an even lighter alternative while still allowing for continuous uninterrupted use.

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With its six-cell battery, the TravelMate B113 can achieve more than seven hours of battery life, avoiding the need for recharging in the classroom where only a few outlets may be available.

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The spring is wound for half a minute, and then unwinds over six minutes, charging a battery in the process, and providing enough energy to run the radio for an hour. (This means the radio's spring-controller circuit is no longer necessary.) Thus, Freeplay has switched from making solely spring-powered devices to making battery-powered devices that are equipped with a clockwork mechanism for recharging and emergency use.

ECONOMIST: Clockwork technology

Today's hybrids use a wimpy battery by comparison, and they can't be plugged in for recharging.

FORBES: Jump Start

Featuring the country's largest 2, 600mAh battery capacity and quickest recharging time among all smartphones available in the domestic market, the battery pack is ideal for the busy lifestyles of modern users.

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