As one of its daily deals, All4Cellular offers this 2,500mAh Portable Backup Battery with Four Adapters in Leopard for $9.99 with free shipping. That's the lowest total price we could find for a comparable item by $6. It provides backup power to USB-compatible devices and comes with four interchangeable adapter heads (an Apple 30-pin, mini-USB, micro-USB, and Nokia tip). Deal ends today.