The Duracell myGrid Mobile USB Charger is ideal for those who use more than one USB-powered gadgets. The device comes equipped with a Lithium-ion rechargeable battery that provides enough juice for smartphones (around 4 hours), MP3 players (30 hours), and e-book readers (100 hours). You can recharge its internal Lithium-ion rechargeable battery via a USB port. The Duracell myGrid Mobile USB charger is currently available for $35
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