A new battery management system means you can forget about hunting for an outlet. The $139 BatteryBox is an the external charger promises to juice up your MacBook for 6 to 12 hours or fully charge eight iPhones. Created by company GBatteries, the battery management system controls energy flow during charging, idling and use of a battery, giving it 10 to 40 percent more capacity and four times more cycles.
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