Click, click, click: that is one of the worst sounds you can hear when you turn the key to crank your car, but jump starters turn it from a day-ruining sound to a minor inconvenience. A portable jump starter gives you the independence of not relying on roadside assistance or the kindness of strangers to keep you from being stranded. It does not matter where you parked; unlike with jumper cables, you do not need to stress about getting another car close enough to jump your battery. The standalone power source charges your auto battery in a few short minutes, giving you time to sit down and relax for probably the first time all day while it does the work for you. An emergency jump starter helps with more than cars by boosting the batteries of vehicles, such as boats, motorcycles, and lawn mowers. Some include DC power outlets as well, enabling you to plug in your cell phone when Murphy's Law strikes; it is almost inevitable that you have car trouble only on days when you forgot to charge your phone. Dependable sellers on eBay offer convenient shipping options on a wide selection of jump starters so you can find exactly what you need, such as a high-amp powerhouse or a tiny, inconspicuous version to slip into your teenager's trunk.