HP Revolve 810 Laptop Portable Charger - External Laptop Battery Pack (Dual USB Power Bank, 18000mAh, Multi-Voltage 5V 12V 16V 19V) Replacement HP Revolve 810 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. Equipped with 3 outputs for greater versatility: 1 DC 12V,16V,19V/3.2A, 1 USB 5V / 1A port and 1 USB 5V / 2.1A port. Charge your laptop on the go! You can charge your laptop, phone and tablet at the same time. One Year Warranty, Includes extra 6 phone connectors, 10 laptop connectors and 1 USB cable Capacity: 18000mAh, Upstart Battery Brand On Sale for a Limited Time!