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All4Cellular offers the refurbished iSound 16,000mAh Portable Power Max Backup Battery, model no. DGIPAD-4544, for $44.95 with free shipping. That's $28 under the best price we could find for a new unit. It charges up to five USB-powered devices, including smartphones, iPad, iPod, and MP3 players. Deal ends May 5.
No warranty information is provided.