With its on board lithium battery and multiple charging options car socket, USB, or AC outlet, the Brunton Torpedo 2800 charger is perfect for fast paced commuters and anyone who wants to stay connected without ever being tied down. . High grade Lithium ION cells charge faster and last longer. Charge the Torpedo in your car or at home and take the power with you wherever you go to recharge your phone, mp3 player, camera, or GPS. Fully charged Torpedo provides up to 2 full smartphone charges. No memory and minimal discharge lasts for 1,000 cycles at 80% capacity. Charge times: 12v car socket, 2 3 hours USB, 3 hours ACUSB, 3 hours. 2800mAh Lithium polymer battery 1 Amp output. Dimensions: 0.7 x 2.1 x 1 in. 1.7 x 5.3 x 2.5 cm. Weighs 4.8 oz. 206 g.