Amazon Kindle DX Portable Charger - External Battery Pack (Dual USB Power Bank, 8000mAh, 2x 2A Output) Replacement Amazon Kindle DX Portable Charger. This external battery pack can give your device a quick charge when battery is running low. Also works with other devices that charges via USB. Convenient small size that fits nicely in your pocket purse or small bag One Year Warranty, Includes 1 Micro USB cable to charge the power bank. Capacity: 8000mAh, Upstart Battery Brand On Sale for a Limited Time!