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Revi Charger is a new, credit card-sized back-up battery and phone cable/charger. Its 2.5mm frame packs a 550 mAh battery.
About the thickness of two credit cards, the Revi Charger fits into a wallet. With its flexible, built-in cable design, there's no need to carry extra cables.
The Revi Charger can simultaneously charge its own battery and a smart phone when plugged into a USB port. It comes in micro USB and Lightning cable versions. It's available for pre-order at www.ReviCharger.com with pricing starting at US$25.