OrderBorder offers the Miccus ChargeBlock Mini for iPhone / iPod, model no. CBFI-01, for $15. With free shipping, that's the lowest total price we could find by $5. Compatible with most iPhone and iPod models, this external battery measures 1" and purports to boast up to 11 hours of audio, 3.5 hours of talk, 3 hours of video, and 2.5 hours of Internet usage from a single charge. Deal ends October 24 at 3 am ET.