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If you whipped this gadget out to jump start your car, you may be given a few strange looks.

But despite its small size, this portable battery pack can not only charge smartphones, it also has enough power to revive large vehicles.

The 'Jumpr' charger weighs only 7 ounces (0.2kg) and is 5.5 inches (14 cm) long – about the same size as a large smartphone.

Small but powerful: The 'Jumpr' charger weighs only 7 ounces (0.2kg) and is 5.5 inches (14 cm) long - about the same size as a large smartphone

For comparison, a standard battery charger that can be kept in the car boot weighs in the region of 25lbs (11kg).

Created by California-based JunoPower, the 6,000 mAh battery features a USB outlet for charging up mobile devices.

The company claims it will provide around one per cent of juice for every minute and a half it's plugged into a mobile.

However it also has a 12-volt 150-300-amp output and jumping cables to stop you from having to ask strangers for jumper cables.

Compact: For comparison, a standard battery charger that can be kept in the car boot weighs in the region of 25lbs (11kg) (right) The gadget is just smaller than a standard calculator and easily portable (left)

The company said there may be some limitations on the kind of vehicle the Jumpr can jump, but it should be compatible with most cars with four- and six-cylinder engines.

A built-in LED flashlight also helps if you're stuck in a dark parking space at night.

The gadget itself can be charged up using micro USB or a cigarette power port on a vehicle.

The Jumpr, described as the 'Swiss-Army knife of chargers', is currently available for pre-order until May 1 for $69.99 (£40) from the JunoPower website.

The suggested retail price will move up to $89.99 (£54) after that.

A jump start: The company said there may be some limitations on the kind of vehicle the Jumpr can jump, but it should be compatible with most cars with four- and six-cylinder engines