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The UTRAI JS-9 Car Battery Booster is a compact, multi-functional jump starter delivering 4500A peak current, capable of jump-starting large engines up to 8.5L gas and 6.5L diesel. It features a high-efficiency 150 PSI air compressor with smart preset and auto shutoff, a powerful 600-lumen LED flashlight with multiple modes, and fast 18W USB-C charging input. Designed with advanced safety protections and a durable fire-resistant shell, it’s an essential portable powerbank for drivers seeking reliable emergency support and tire maintenance in one sleek package.






| ASIN | B0D2LB4B8T |
| Amperage | 3000 Amps |
| Automotive Fit Type | Universal Fit |
| Battery Capacity | 15000 Milliamp Hours |
| Battery capacity | 15000 Milliamp Hours |
| Battery cell composition | Lithium Polymer |
| Best Sellers Rank | 9,851 in Automotive ( See Top 100 in Automotive ) 85 in Car Battery Jump Starters |
| Brand | UTRAI |
| Brand Name | UTRAI |
| Compatible with Vehicle Type | Motorcycle |
| Country Of Origin | China |
| Customer Reviews | 4.5 out of 5 stars 290 Reviews |
| Included Components | Battery Pack |
| Item Dimensions D x W x H | 7.5D x 15.5W x 7.5H centimetres |
| Item Weight | 2.69 Pounds |
| Manufacturer | UTRAI |
| Manufacturer Part Number | JS-9 |
| Manufacturer Warranty Description | 2 year manufacturer |
| Model Number | JS-9 |
| Peak Output Current | 3000 Amps |
| Product dimensions | 7.5D x 15.5W x 7.5H centimetres |
| Specification Met | RoHS, CE, or others |
| Vehicle service type | Motorcycle |
| Voltage | 12 Volts |
| battery-cell-composition | Lithium Polymer |
A**Y
Great product - be aware of USB connectivity
I bought this when it was on a 38% discount deal. Had I paid full price I'd rate it 4/5 otherwise the rest of this review still stands. I've tried to provide a lot of detail as I think this is a very good product that's worth having in your car for almost all drivers. Prior to owning this I carried a separate car tyre inflator which connected to my car's cigarette lighter outout. Jump starting could only be done using the cables I carried, which naturally require another vehicle. My car has USB sockets to charge a phone, but of course that relies on the battery of the car working. Initially I was looking at getting a premium product from Nebo that does the same 4 functions as this one: tyre inflation, jump start, USB charging and a torch all in 1 unit. I'd never heard of UTRAI but given how many great reviews it had (and how few the aforementioned product had) I decided to investigate further. Upon arrival I was impressed. This comes in a sturdy black/red case which keeps it all together and clean. You get: the unit itself, jump leads, a tyre inflation hose, some tyre hose nozzles (for different applications such as bikes) and a USB-A to USB-C charging cable. The USB connectivity was my first disappointment. Although this has both a USB-A and USB-C port, the C port is only used as an input for charging it up. This means you don't have USB-C output so if you have a modern phone cable - with only that type of connector - you can't plug it in to this. You'd need the (older, wider) USB-A plug with a USB-C end, which you can buy for not very much. Bizarrely, this unit actually comes with one of those USB-A to USB-C cables for charging it, so you can just use it in the opposite direction. That said the cable is incredibly short. This particular point is the main one where it falls short of the Nebo offering - on theirs you can use both ports for output so could charge 2 devices simultaneously and with different cables, whereas this is a 1 device at a time deal. I charged it up which took over an hour and I believe it was on 3/4 battery when delivered. It says in the instructions to check every 2-3 months that it's recharged, which is acceptable. I used the torch which seems reasonable for an emergency situation - not the brightest but it would help in the dark. The tyre inflator is excellent. It shows units of PSI, BAR, and a third unit which I've forgotten. This is nice because some car manufacturers give tyre inflation recommendations in different units (for example my Honda used PSI whereas my Toyota has BAR figures written on the plate inside the drivers door). The only other downside I came across is that the manual is written in a poor standard of English. You can make sense of it but it really cheapens the product in my opinion because it feels like no care was given to this quite important aspect. The unit in it's bag fits very easily into the car boot in one of those side cubby holes. It would depend on your glove box size as to whether it would fit there. Basically, it's compact enough to not be tedious to carry, which is really all you need to know here. It isn't overly heavy for what it does. Overall this product gives me a lot of peace of mind whilst driving. I drive about 15k miles per year and sometimes I'm in remote places. Knowing that I can jump start my car, use a working torch, inflate my tyres and charge my phone is a massive stress reliever. It's also great for general car maintenance such as checking/topping up your tyre pressure because you don't need to walk around the car with a cable plugged in. The downsides for me don't override the greatness of this product. Is it worth having? Yes. Is it worth the full price? That's up to you - personally it was well worth it for me at a 38% discount but if I'd paid full price I'd think it's a tad expensive given the previously mentioned flaws. I don't regret buying it at all and have already recommended it to somebody else. I'd advise buying a longer (say 1 meter plus) USB-A to USB-C cable if you get this. These are only a few pounds and significantly help both the phone charging issue and even just charging the device itself.
A**N
Great product
Got this for my campervan if battery gets low perfect starts it perfect 👌
J**N
Car booster jump start
Had this a few months now and tried the tyre inflator mode very good indeed. Also used the jump start mode on work mates flat car battery workd a treat so very happy with this unit and would be just as happy to recommend buying this unit
U**5
Great product
Easy to use no complications
R**L
Value for money
Easy to use
R**V
Excellent tool ⭐️⭐️⭐️⭐️⭐️+⭐️
I've had it for a long time and I can safely say that it's a Superb machine. ⭐️⭐️⭐️⭐️⭐️+⭐️
K**R
Very good product
I found my last one so dont need this one thanks
A**R
Poor quality air compressor
Compressor failed on first day on the third tyre top up and had to return. Don’t waste your time with this.
M**L
Arrancador de batería
Funciona bien
M**L
Árrancador de coche
Funciona ala perfección y el inchador lleva buena potencia
I**N
El enfado supera a la decepción. MUY MAL.
Me ha llegado el producto usado, con arañazos. Todo sucio y hasta con pelos de animal dentro de la funda. Pésima experiencia. Si por mí fuese restaría estrellas. Muy decepcionado. Voy a iniciar la devolución y reclamación. Muy mal.
Trustpilot
1 month ago
3 weeks ago