Jolturn Jump Star: Flat battery? Clamp it on and drive off, with no second car and no waiting.
- Starts petrol to 6.0L and diesel to 3.0L
- Won't send power if the clamps are reversed
- Pumps tyres and stops at your set pressure
- Charge it each time the clocks change
How many cars?
- 30-day start guarantee. It starts your car or your money back.
- Covered for 12 months. If it develops a fault, we'll repair or replace it.
- In stock. Arrives in 11 to 18 days, tracked.
“Battery finally gave up on the school run. Clamped it on, waited for the green light and it turned over. I wasn't stuck on a side road with two kids in the back, which is the whole point.”
In the box
- Jump Star unit
- Battery clamps
- Braided air hose
- 3 adaptors
- USB cable
- Carry case
When you'll need it
Winter is when tired batteries give up.
AA figures: on an average day, 1 in 5 of its breakdowns are cars that won't start. On the first working day after Christmas, it's 1 in 3.
The first frosty morning
Cold makes a battery work harder to turn the engine over. If it's already tired, that's the morning it gives up.
Back from a fortnight away
A parked car slowly drains its own battery. After a fortnight at the airport there may not be enough left to start it.
Tyre light on, miles from home
Top it up where you've stopped, then get it looked at.
Two cars on the drive
Keep one in each boot, so neither of you is left waiting.
How it works
It starts the car on its own power.
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Clip the clamps on
Red to positive, black to negative. If they're the wrong way round, it won't send any power.
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Wait for the green light
The light on the clamp lead tells you it's connected properly.
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Turn the key
The engine turns over. Unclip it, pack it away and drive off.
Your options
Three ways to deal with a flat battery.
Breakdown cover is still worth having for the faults that need a mechanic or a tow. For a flat battery, the quickest fix is the one already in your boot.
Owners, on the morning they needed it.
Battery had been struggling for a fortnight and finally gave up on the school run. Clamped it on, waited for the green indicator, and it turned over on the second attempt. I've since replaced the battery, but I wasn't stuck on a side road with two kids in the back, which is the whole point.
Ordered two because the review here said moving one between cars defeats the object, and that's exactly right. One lives in my boot, one in my husband's. Neither of us has had to think about it since, which is what I wanted.
Does both jobs properly and the build is better than the price suggests. The compressor is noisier than I'd assumed from the photos — not a problem on a driveway, but you notice it. Four stars for that rather than anything to do with how it works.
I'd been putting off doing my tyres for weeks because the pump at my local garage is always occupied. Did all four on the drive on a Sunday morning with a cup of tea. The display is genuinely easy to read, which matters when you're crouched by a wheel.
Everything has its own slot, so it goes back in properly instead of ending up loose under the parcel shelf like my old jump leads did. Small thing, but it means it's still tidy three months later.
Works exactly as described. My only note is that the hose is short enough that the unit has to sit right next to the wheel — fine on tarmac, less ideal on a wet verge. Would still buy it again.
Bought it for my own car and have not needed it yet. Used it twice on my son's, once in an Asda car park in the rain. He has now ordered his own.
It does what it says, but I left it in the boot for two months without topping it up and it was down to one bar when I finally needed it. Worked, but only just. That's on me rather than the unit — I'd just say don't assume it holds charge indefinitely.
Managed it without opening the manual, which is not usually true of things I buy. Red to red, black to black, wait for the light, turn the key.
It starts your car, or you get your money back.
If a charged Jolturn won't start a car it's rated for within 30 days of delivery, email us and we'll refund you.
Starts on delivery
The 30 days start on the day it arrives, so you can test it before you need it.
12-month extended warranty
If it develops a fault, we'll repair or replace it.
A real person on every email
Every message is answered by someone at Jolturn, within one working day, Monday to Friday.
Put air in a tyre wherever the car's parked.
Tyres lose pressure slowly, and cold mornings drop it further.
Instead of hunting for a forecourt pump that works, attach the hose and set your pressure. It switches off at that number.
Open the driver's door and look at the frame. Most cars print their recommended pressures on a label there, with one figure for a light load and a higher one for a full car. Failing that, check inside the fuel flap or the handbook. Read tyres cold, before you drive.
How long each job takes.
Times vary with engine size, temperature and starting pressure.
Questions.
What people ask before they order.
Will it work with my car?
Yes, if it's an ordinary car or van. It's built for 12V systems, which is what ordinary petrol and diesel cars and vans use, and its 1600A peak current starts petrol engines up to 6.0 litres and diesels up to 3.0.
The exception is 24V systems, found on lorries, some plant and older commercials. If you're not sure what you have, email us before you order and we'll tell you.
What if it doesn't start my car?
Then you get your money back. If a charged Jolturn won't start a vehicle it's specified for (12V, petrol up to 6.0 litres, diesel up to 3.0), used as the manual sets out, email us within 30 days of delivery with your order number and a short clip of the attempt. We refund in full once the unit is back with us and has been checked.
The guarantee covers the unit doing its job. It can't cover a battery that's damaged, leaking or frozen, or a fault elsewhere in the car, such as a starter motor, an immobiliser or an empty tank, because no jump starter can start those.
Will it still be charged when I actually need it?
Yes, if you charge it when the clocks change, twice a year.
What if I get the clamps the wrong way round?
It won't send any power. Reverse-polarity protection is built in, along with overload and overheat protection, and the light on the lead only shows a good connection when the clamps are on the right way.
Do I need another car, or anything plugged in?
No. It carries its own lithium-ion battery and works on a driveway, a supermarket deck or a lay-by with nobody else involved. You charge it at home over a USB cable and it lives in the boot until the morning you need it.
Will it fix a battery that keeps going flat?
No. It will start the car so you can drive it somewhere useful. A battery at the end of its life still needs replacing.
Can it deal with a puncture?
No. It puts air into a tyre that's low. A tyre that's leaking will go down again, and that's a job for a garage.
What about the cheaper ones online?
Most of them are sold on the number of functions (7-in-1, 12-in-1), which tells you nothing about whether they'll start your car on a cold morning. The two figures that decide that are peak current and airflow: 1600A and 40 L/min here.
The unit has reverse-polarity, overload and overheat protection built in, and every part has a moulded seat in the case. And there's a UK company to email if something goes wrong.
Who am I buying from?
Jolturn, a UK company. Warranty claims and returns come straight to us, by email.
Full specification.
| Peak current | 1600A |
| Vehicle output | 12V DC |
| Air compressor range | 0–150 PSI |
| Airflow | 40 L/min |
| Pressure monitoring | Digital, in PSI, BAR, KPA or kg/cm² |
| Compressor run time | 5–20 minutes |
| Wireless charging | 10W Qi |
| USB output | Dual USB, 5V / 2.4A |
| Battery | Built-in lithium-ion |
| Housing material | ABS + PC |
| Net weight | 800g |
| Lighting | LED work light, emergency warning light |
| Protection | Reverse-polarity, overload, overheat |
| Vehicle compatibility | 12V petrol and diesel cars and vans |