But the cells used in these units aren't exactly the best. Eg. "Hoverboard" or "E-cigarette" quality particularly the ones that make the news. I'm sure they'll dump power fast enough for a jumpstart ...

All cigarette lighter sockets are also 12v sockets, which means that you should be able to plug in a cigarette lighter inverter, cell charger, or any other 12v DC accessory into any cigarette lighter ...

The two most important specs to consider when comparing portable jump starters are milliamp-hours (mAh) and peak amperes ...