JunoJumper

Portable Jump Starter

The Juice

The JunoJumper is a portable battery pack, with enough power to jumpstart most 4- or 6-cylinder cars. 12 volts, 300 amps, all in a pack roughly the size of a cell phone (and it charges those, too).

Here at The Grommet we put JunoJumper to the test. Fortunately, our offices are right next to a body shop. We plugged it into a
long-idle Mercedes SUV. Fired right up.

And we didn’t need extra cables, because JunoJumper comes with a set. It also comes with an innovative SMARTec cable that indicates when your car is ready to jump. Plus there’s a LED-light to help operate in the dark, if you weren’t lucky enough to kill your battery during daylight.

The JunoJumper includes a USB port as well. Use it to bring your phones and tablets back to life. Obviously, it's up to the task. As for charging the JunoJumper itself? That can be done with a car charger, or via the included micro-USB cord. It’s like a circle of power.
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Junojumper - Portable Jump Starter

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Grommet Launch Conversation

  • Johnson
    Johnson

    Hey, we're proud to introduce the JunoJumper to The Grommet. The JunoJumper is one of the slimmest and most portable jumpstarters for your car. Charge your USB devices and jumpstart your car on the go with our portable charger. Proprietary jumper cables are included. I'm here to answer any questions you have!

  • Kelli
    Kelli
    2/24/2015 12:26 PM

    Hi. I am wondering how long the JunoJumper will stay charged if not used. Just want to know if I keep it in the car how often would I need to get it out and make sure it is charged. Also, if I use it to charge my cell phone say twice will it still be able to jump start a car? Thanks.

  • Johnson
    Johnson – Special Guest
    2/24/2015 12:30 PM

    @Kelli Hey Kelli, it depeneds on temperature really - the Junojumper should stay charged enough to jumpstart your car up to 4-6 months depending on temperature (not too hot or too cold) What kind of cellphone are you using? Typically on an iPhone if you charge it fully from 0-100% twice, you might not have enough to jumpstart a completely dead car. We suggest minimum of 2 lights on the device (out of 4) to jumpstart.

    Hope this answers your question!

  • Lauri
    Lauri
    2/24/2015 12:36 PM

    @Johnson Hi, if it'll start a car and charge a phone, is it safe to assume it'll work on a mac book, even for extending the battery on an airplane ride?

  • Johnson
    Johnson – Special Guest
    2/24/2015 12:39 PM

    @Lauri Hey Lauri, the Junojumper is only capable of jumpstarting cars and charging phones and tablets, (USB Devices) and not Macbooks. Sorry :(

  • sommer
    sommer
    2/24/2015 3:38 PM

    @Johnson with a converter for Mac?

  • Sandra
    Sandra
    2/24/2015 12:36 PM

    Will it work to jump start any car, or just newer a one? My daughter owns a '71 VW Bug. With the battery under the back seat, regular jumper cables don't often reach, especially when parked between other cars in a parking lot. This would be great if it works for old cars too. Thanks!

  • Johnson
    Johnson – Special Guest
    2/24/2015 12:42 PM

    @Sandra Hello Sandra, it will jumpstart most cars - old and new, as long as the cranking power is less than 300A (which i think your 71 Bug is). Thanks!

  • BJ
    BJ
    2/24/2015 1:04 PM

    @Johnson Two questions - I've an eight cylinder older vehicle. 91 Grand Marquis. Secondly, how safe is this product that it can jump start a car battery. That sounds pretty heavy duty. I'm certain you can't get electrocuted but could you elaborate? What if it's raining or your hands or wet or you touch both cables to each other. What about small children getting their hands on it? Thanks!

  • Mike
    Mike – Grommet Team
    2/24/2015 1:20 PM

    Hi BJ, the JunoJumper works best with four and six cylinder engines so the 91 Grand Marquis might have difficulty. It is recommended you don't use the JunoJumper in the rain for, but use it at your own discretion. And as always, it's best practice to be careful with the device, like any device of this nature, around small children.

  • Johnson
    Johnson – Special Guest
    2/24/2015 2:19 PM

    @Mike Hey Mike thanks for the response.

    @BJ - in regards to small children getting their hand on it - they would really have to plug it in, turn it on then connect to somewhere conductive before anything happens. Jumping cars in the rain always is not recommended and we always recommend wearing rubber gloves regardless in the rain or not for added protection.

    Our SMARTec cables will shut off it it senses any short circuiting or reverse polarity connections, so there is a an added security measure there as well.

  • Albert
    Albert
    2/24/2015 6:15 PM

    @Sandra I'm not sure if this is an issue for you, or even it it is an issue at all, but when I was younger, I worked in a gas station and I was told to charge a lady's dead battery, which was also located under the back seat (go figure!). What I didn't know was that it was a 6 volt system! It didn't take long before I hooked up the charger to the battery before it blew up. If your VW is a 6 volt system, you might want to ask about this.

  • Jeff
    Jeff
    2/24/2015 12:45 PM

    What is the size of the case for this (device with cables)? Could it fit into the pocket of a typical coat?

  • Jules
    Jules – Grommet Team
    2/24/2015 12:57 PM

    @Jeff Here is the dimension set: Dimensions: Battery 5.2" X 2.9" X 0.5"; Cables 14" long. Johnson--have you carried the cables around in a coat pocket? That seems borderline doable to me.

  • Jeff
    Jeff
    2/24/2015 12:57 PM

    Apparently there is no information regarding the envelope size of case for this unit.

  • Jeff
    Jeff
    2/24/2015 12:59 PM

    Do they come in a case or do you just carry the charger unit and the cables separately?

  • Johnson
    Johnson – Special Guest
    2/24/2015 12:59 PM

    @Jeff The device is small enough to fit in the coat pocket and the cables can fit in a separate pocket if needed. It's very easy to carry with you on the go.

  • Johnson
    Johnson – Special Guest
    2/24/2015 1:04 PM

    @Johnson we currently dont have a carrying case for the product yet. Sorry!

  • Tunde
    Tunde
    2/24/2015 12:51 PM

    How many can i buy at a time to resell in Nigeria?

  • Johnson
    Johnson – Special Guest
    2/24/2015 12:54 PM

    @Tunde Hey Tunde, you'll have to reach out to The Grommet for bulk pricing. Thanks!

  • Mike
    Mike – Grommet Team
    2/24/2015 1:01 PM

    Hi Tunde, connect with our customer experience team here to tell us a little more about what you are looking for.

  • Nikki
    Nikki
    2/24/2015 12:54 PM

    Hello. Is there any type of warranty on the product?

  • Johnson
    Johnson – Special Guest
    2/24/2015 1:03 PM

    @Nikki Hey we have a 1 Year warranty on our Junojumper. As long as you don't go jumpstarting a tank or a spaceshuttle, it will be covered under normal use up to 1 year!

  • Clifford
    Clifford
    2/24/2015 1:07 PM

    Hi: Could you please tell me the weight of the unit and also some other spec's: capacity in mAh, and approximate weight; will the USB output charge at 2.1 amps? The size is great, much smaller than my "Gorilla Gadget."

  • Johnson
    Johnson – Special Guest
    2/24/2015 1:11 PM

    @Clifford The size of the battery is 5.2" X 2.9" X 0.5" with a net weight of 7 ounces. It packs 6000mAh and the 5V USB will charge at 2.1A.

  • Mike
    Mike
    2/24/2015 1:20 PM

    Great idea for a product but I'm curious, will it work on a motorcycle battery since it's a different voltage than a car.

  • Johnson
    Johnson – Special Guest
    2/24/2015 1:33 PM

    @Mike I'm assuming your bike is 6V? Most bikes today are 12 V, so it will work with the motorcylce battery, as well as lawn mowers, off road buggies, ATVs, etc. Unfortunately for those with 6V motorcycle batteries, it depends on the circuitry of your bike. Due to not all circuitry being able to accept 12V juice, it's not recommended to try and start a 6V bike.

  • Albert
    Albert
    2/24/2015 1:22 PM

    How long does it take to charge the JunoJumper?

  • Johnson
    Johnson – Special Guest
    2/24/2015 1:29 PM

    @Albert through a 2.1A USB port, it will take around 4-5 hours. Through the 12V cigarette port, it will take around 2.5 hours.

  • Craig
    Craig
    2/24/2015 1:25 PM

    Hi.

    I have a V8 Lexus LX470. Your comments mention that it has enough power to jumpstart most 4- or 6-cylinder cars, but how would it do with my V8?

    Thanks,

  • Johnson
    Johnson – Special Guest
    2/24/2015 1:31 PM

    @Craig We have not tested this on the LX470 yet, but it did jumpstart the LS460 without a hitch. Best thing to do is try and find out what your peak amp draw in the LX470 is. I believe it is less than 300A, so you should be fine. We've had reports of the Junojumper starting a F150 truck and a ML55.

  • Bob
    Bob
    2/24/2015 1:27 PM

    Hi, Would this work with 6 volt devices? Thanks.

  • Johnson
    Johnson – Special Guest
    2/24/2015 1:34 PM

    @Bob I'm assuming your referring to a bike at 6V? Those with 6V motorcycle batteries, it depends on the circuitry of your bike. Due to not all circuitry being able to accept 12V juice, it's not recommended to try and start a 6V bike.

  • Janet
    Janet
    2/24/2015 1:39 PM

    Sorry if this has been answered elsewhere. Looks like it can be charged from the cigarette lighter of the car. Is is ok to just plug it in and leave it in so it's always ready? Or will that cause damage to the JunoJumper or potentially drain the car battery?

  • Johnson
    Johnson – Special Guest
    2/24/2015 1:44 PM

    @Janet The Junojumper will shut off when fully charged. We don't recommend it to be always plugged in as the battery may slowly drain then recharge and that may decrease the battery life. Most of our users use the battery daily as a phone charger an leave the cables inside the car. But if you want to charge the battery first, you can always leave it in the glove compartment and just do a quick check monthly for battery capacity. Capacity is shown with 4 bright LED lights, each indicating 25%. it is recommended to have at least 2 LED lights to jumpstart your car.

  • max
    max
    2/24/2015 1:44 PM

    I like this little unit. I'm a mechanic, and not being very trusting of machines to begin with, a little pocket-size jump starter for a car or other vehicle is actually a very good idea. I do have one question, however: I did not see that this has an onboard polarity indicator. While most people do know how to put the clamps to the battery posts, some others don't know about the importance of maintaining polarity, red to red, black to black,if red is clamped black, and vice versa, the very least that will happen is the car battery is going to die a spectacular death, the worst being that a significant portion of the wiring is gonna fry, not to mention polarity-sensitive components, such as one or more of the onboard computers. So, if it isn't there, then in the next iteration of the new model should come with the relevant electronics including a pair of indicator lights, one green indicating a proper connexion, red light to warn.

  • Johnson
    Johnson – Special Guest
    2/24/2015 1:51 PM

    @max Great comment here... but be relieved!

    First off - the blue part of the jumper cable (the ones that plug into the Junojumper) is made only 1 way in - so you can only plug it in 1 way (not vice versa) so your polarity is always right.

    Second - even with the Red and Black and + - clamps, we know that people may get confused in a rush. So in our SMARTec cable, there is a built in buzzer. If you accidentally swapped the polarity, it will buzz, and the circuity will cut off from drawing / sending power through the cables.

    Third - there IS a green LED and Red LED on the cable itself. If green you're good to go. If Red with a buzzing sound, wrong polarity. If a flashing Red, no buzz, just means your battery is REALLY dead and there is a small boost button on the side to press to quickly do a quick discharge to your car battery in hopes of seeing the Green light to start.

    Long story short, we've made the unit pretty foolproof to use, and we hope our precautions will help people all around the world save themselves from a car with a dead battery.

  • Edith
    Edith
    2/24/2015 1:54 PM

    @max That's a freaking great idea. I hope they do that!

  • Johnson
    Johnson – Special Guest
    2/24/2015 2:00 PM

    @Edith Edith, see my reply above :) we got you guys covered! Built in chip and buzzer will indicate whether its connected correctly or not :)

  • Mark
    Mark
    2/24/2015 2:17 PM

    Have you any intentions in the near future of making a larger unit rated for V8 engines which would then cover pretty much all cars/trucks out there?

  • Johnson
    Johnson – Special Guest
    2/24/2015 2:20 PM

    @Mark We do have a larger V8 / Laptop / all in one charger that is coming out in 2015 but we dont have a set timeframe yet (probably summer or fall). When we do get that one in.. You'll be sure to find that on The Grommet!

  • David
    David
    2/24/2015 2:25 PM

    Hello,

    Could this be used to jumpstart a 2-cylinder v-twin motorcycle? Thanks - David

  • Johnson
    Johnson – Special Guest
    2/24/2015 2:26 PM

    @David Hey David, if your motorycle is 12V, then yes it can!

  • david
    david
    2/24/2015 2:36 PM

    I'd like to use the juno-jumper to recharge a mobility scooter battery - either

    1] two sealed Lead-acid batteries each 12 volt batteries connected in series,

    2] Lithium-Ion Li-ion - 24 Volt, 12 Ampere-hour

  • Johnson
    Johnson – Special Guest
    2/24/2015 3:04 PM

    @david Hey David,

    The Jumper is not a substantial enough amount of power to recharge a mobility scooter. It surges at 300 amps and can jump start a vehicle battery (under v8), but the batter it self is 12 volts.

  • Nicholas
    Nicholas
    2/24/2015 2:49 PM

    Can you plug it in a wall socket to be charge ?

  • Johnson
    Johnson – Special Guest
    2/24/2015 3:04 PM

    @Nicholas Hey Nicholas,

    Yes the battery can be plugged into an AC wall adapter to be charged.

  • ira
    ira
    2/24/2015 3:30 PM

    you need to change the text on this page. you did not jumpstart a mercedes SUV - it was aford. not a big deal wxcept it coud confuse someone regarding the engine size you can charge.

  • Mike
    Mike – Grommet Team
    2/24/2015 3:42 PM

    Hi Ira, we did jump a Mercedes SUV at first, but when it came time to film the SUV was off the lot and instead we jumped and filmed a Ford which is what you see. We mention the Mercedes because it was the first one we tested.

  • Johnson
    Johnson – Special Guest
    2/24/2015 3:44 PM

    @ira Ira,

    Sorry for the confusion! The brand of the car is really not relevant to the power of the battery, and we actually have jump started Mercedes SUV's before. Thanks for pointing that out, it will be fixed in a matter of minutes!

  • Jules
    Jules – Grommet Team
    2/24/2015 4:01 PM

    @Ira--you are a sharp reader/observer. I love that! Just to make things even more interesting...the Mercedes SUV actually had been dead for years. It was brought to the body shop next door because someone was moving and needed to get it out of the driveway!

  • Barbara
    Barbara
    2/24/2015 5:12 PM

    @Jules not sure how big a Mercedes SUV is. How about an GMC Envoy from 2002?

  • Johnson
    Johnson – Special Guest
    2/24/2015 6:03 PM

    @Barbara Barbara, it should jump any car battery that has less than a V8 engine.

  • Sylvia B
    Sylvia B
    2/24/2015 4:17 PM

    Would this work to charge the start-up battery of a 2003 Prius that dies in cold weather?

  • Johnson
    Johnson – Special Guest
    2/24/2015 4:32 PM

    @Sylvia B Good question! Our batteries have actually been tested in pretty extreme weather conditions including Korea in the winter during which the Jumper worked just perfectly! Give it a go, it can handle cold weather just fine.

  • Barbara
    Barbara
    2/24/2015 5:27 PM

    I do not know how big a Mercedes SUV is. Would it work with a 2002 GMC Envoy SUV?

  • Mike
    Mike – Grommet Team
    2/24/2015 5:34 PM

    Hi Barbara, since it is a 6-cylinder engine, you should have no trouble.

  • Johnson
    Johnson – Special Guest
    2/24/2015 6:04 PM

    @Barbara yes it will jump start a GMC Envoy SUV

  • Dai
    Dai
    2/24/2015 5:50 PM

    I'm not very knowledgeable about electricity, current, amps. But, is there such a thing nowadays as too much power going into a smartphone to charge it, perhaps create a problem with its battery? The JunoJumper is 60000mAh so this sounds high. Maybe new tech doesn't have the issues of yesteryear?

  • Dai
    Dai
    2/24/2015 5:59 PM

    Sorry, I meant to type "6000mAh"

  • Johnson
    Johnson – Special Guest
    2/24/2015 6:11 PM

    @Dai The ports that charge your phone and jump your car battery are two different ports with different power flows. 6000mAh just represents how much energy the battery can store, the mAh amount is unrelated from the flow of the power from one device to another. On the Juno Jumper the flow of power is consistent in the USB socket (the port where you can charge phones and tablets), while in the port meant for plugging in your jumper cables provides peaking surge of power to jump a car battery (unlike the consistent and SAFE flow of power in the USB socket). Hope this helps answer your question!

  • Joel
    Joel
    2/24/2015 7:09 PM

    @Johnson Great job on this product. I have told a lot of folks about it already.

    What battery chemistry are you using? I assume LiIon (18650?) 3 in series to get the voltage and then paralleled with another 3 to get the amperage?

  • Johnson
    Johnson – Special Guest
    2/24/2015 7:51 PM

    @Joel We use lithium polymer battery technology for longevity and safety purposes. Even though we have possibly almost every single precaution built in (from smart cables to chips), there may still be times where users try to jumpstart a car they're not supposed to. Lithium Polymer batteries are more resistant to overcharges and can provide higher bursts of power when needed (as opposed to Lithium Ions)

The launch day conversation has ended. Please direct further questions about this Grommet to our Community Experience Team.