As one of its daily deals, TigerDirect offers the DGM Mobile Pocket Power 3,800mAh External Backup Battery Pack, model no. ICB07, for $11.99 plus about $4 for shipping. That's $58 off and the lowest total price we could find for any such 3,800mah backup battery. It features an LED charge status indicator and compatibility with a wide range of devices via its USB port and included adapter plugs. Deal ends today.