Get Upto 60% Discount On Car Jump Starter At Amazon.com. A compact power bank, a car jump starter, and a LED flashlight, all fit into a minimal and portable design. Whether it is the car or the USB devices, never run out of power again. Store it in the glove box or simply drop it in the bag. Have a concentrated 14000 mAh source of power always with one. RAVPower car jump starter will take care of most 12 V battery cars and USB devices that run out of juice: smartphones, tablets, GPS systems - one name it. Forget what its like to run out of power with RAVPower. Turn the LCD display on and make sure the battery level is at least 60%. Connect the jump cable to the car battery. Plug the jump cable into the battery pack. Start the car by turning on the ignition. Unplug the jump cable off the car battery as soon as the car has started.