Your portable external battery is nothing compared to JUMPR, an incredibly slim, portable external battery from Juno Power that can jump start a car. Measuring 139mm by 75mm by 15mm, the battery weighs 7 ounces and includes both 12V (150-350A) and USB 5V 2.1A outputs, with a capacity of 6000mAh. JUMPR is currently available for pre-order via Juno Power’s website.