Pocket-sized Jumpr can jump start your car, and charge your phone


May 20, 2014

Juno Power claims its new Jumpr is the smallest car jump starter in the world

Juno Power claims its new Jumpr is the smallest car jump starter in the world

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Juno Power's new Jumpr is small enough to fit in a glove compartment, and light enough to carry in a coat pocket or backpack, but is claimed capable of jump-starting a car. And it can charge your smartphone, too.

The Jumpr measures 5.5 x 3 x 0.6 in (14 x 7.6 x 1.5 cm) and weighs 7 oz (0.2 kg). That's not hugely dissimilar to a Samsung Galaxy S5, albeit a bit thicker and heavier. It is certainly a dramatic departure from traditional briefcase-like jump starters and Juno Power says it's the smallest you'll find.

The device houses a 6,000 mAh lithium polymer battery and produces a 12 V output at a peak of 300 Amps. Juno Power says, "300 Amps is enough to jump-start almost all 4-Cylinder and 6-Cylinder engines as well as possibly enough to jump start more depending on type of model."

In addition to jump-starting a car, the device features a 5 V/2.1 Amp USB output that can be used for charging mobile devices such as smartphones and tablets. With its 6,000 mAh battery, the Jumpr should charge a Galaxy S5 (which has a 2,800 mAh battery) more than twice before needing a top-up itself. A flashlight is also featured.

The Jumpr is available now for US$89.99.

The video below shows the Jumpr in action.

Product page: Juno Power Jumpr

About the Author
Stu Robarts Stu is a tech writer based in Liverpool, UK. He has previously worked on global digital estate management at Amaze and headed up digital strategy for FACT (Foundation for Art and Creative Technology). He likes cups of tea, bacon sandwiches and RSS feeds. All articles by Stu Robarts

It would have been helpful to have been told how long this device will hold its charge and also how long it takes to charge. Should it be recharged from the mains or from a car cigarette lighter point?

It would be cheaper for most of us to buy a new car battery well before it became problematic but one can imagine a device like this being a priority buy for firms that do occasional rescue jobs. [Regular rescue operators might prefer the old fashions jump leads - which always work]


I think that is a very useful device. It is portable and powerful. I think it is a must have for any motorist and/or traveller.


too expensive cost for just 3S LIPO and 5v charger


Nice idea but there is a slight problem: LiPo batteries will discharge over time, should not be trickle-charged and should be stored in a discharged state.

In other words they are only really useful when you know you will need them and can charge them shortly before use.

That doesn't really work for unforseen events like a flat battery.

Sorry rally, you are correct only in the fact that ALL batteries have a "self-discharge" number, Lithiums are in fact one of the lowest for self discharge (approx. 15%/year at normal temperatures). Unless they are connected to a circuit that is using current.

Trickle charging is fine, and Lithium cells should NEVER be stored in a discharged state, as this will essentially destroy the batteries electrode material.


Mass produce & sell online & Auto Zone, Office depot, Staples, Pep Boys etc for dual use Nice.

Stephen Russell

In my experience jump start is needed mainly when the temperatures drop and the available battery power drops drastically. This situation is rare in normal weather for failed alternator. Rescue vehicles still prefer generators mounted on the rescue truck's bed. These work regardless of the temperature or engine size of the vehicle.


Nothing new here. I've owned such a device for a few years now. Paid $125 then. Well worth the money. Make no mistake - it lacks the punch to start a vehicle with a dead - or nearly dead - battery. It does have the capacity to act as a battery assist. More important point is that it's not a 'set and forget' device. ANY battery self-discharges over time. If one doesn't make a point to charge it periodically, they'll have two dead batteries to deal with

Noel K Frothingham
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