Idealpoint via Amazon offers the New Trent PowerPak 11,000mAh External Battery Pack and Charger, model no. NT110T, for $38.95. Coupon code "NTPOWERS" cuts it to $28.95. With free shipping, that's $21 under the lowest total price we could find for a similar powerpak. This external battery pack is compatible with a range of iOS and Android devices.