Rated by 15,000+ Customers

Portable Boost X GBX155 4250A Jump Starter

Portable Boost X GBX155 4250A Jump Starter

Powerful starts for every engine, anywhere, anytime.

check_circle Jump-starts anything up to 10.0L gas or 8.0L diesel

check_circle Recharges in just 5 minutes with USB-C technology

check_circle Doubles as a flashlight and power bank for all your devices

In Stock, Ships by
Money Back Guarantee

30 Day Guarantee

If you're not 100% satisfied within the first 30 days, just send it back to us and we'll give you a full refund

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Is This For You?

If you check any of these boxes, this is for you:

  • You’ve ever been stranded with a dead car, truck, or boat battery
  • You want total peace of mind during roadside emergencies
  • You need dependable power in extreme weather or remote areas
  • You want one compact device that charges everything — from laptops to phones
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Specs & Features

Peak Power: 4,250 Amps

Engine Compatibility: Up to 10.0L Gas / 8.0L Diesel

Recharge Speed: Full charge in 2.7 hrs or 5-min quick charge for instant jump-start

Ports: USB-C Power Delivery (In/Out, 60W), Dual USB-A Outputs

Battery Type: Advanced Lithium with UltraSafe™ 2.0 protection

Flashlight: 500-Lumen LED with SOS and Strobe Modes

Safety: Spark-proof, Reverse Polarity, Thermal Protection

Operating Temp: -4°F to 122°F (-20°C to 50°C)

Build: Heavy-duty clamps, reinforced casing, and compact storage design

Included Accessories: GBX155 unit, HD booster clamps, USB-C cable, microfiber bag

Warranty: 1-Year Manufacturer Guarantee

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Shipping Information

We offer fast and reliable shipping on all orders. You can expect to receive it within 7-10 days based on your location.

Please contact our customer service team for assistance if you have any questions or concerns about your shipment.

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Our Guarantee

If you're not 100% satisfied within the first 30 days, just send it back to us and we'll give you a full refund

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"It’s exactly as described! I jumped my 47 Ford F1 with it as soon as it showed up. Way better than busting out jumper cables. Should have ordered this months ago."

George M.
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The Only Jump Starter You’ll Ever Need

    Featured on

    Jump-starts Dead Batteries in Seconds

    Don’t wait for roadside assistance when you can take control.

    The GBX155 delivers an industry-leading 4,250 amps, capable of reviving 10.0 L gas and 8.0 L diesel engines instantly.

    Its smart-boost override ensures even completely dead batteries come back to life — no second vehicle required.

    🚨 Ready for Any Roadside Emergency

    More than a jump-starter — it’s your complete safety companion.

    The GBX155 packs a 500-lumen LED flashlight with SOS and strobe modes, plus dual USB-C + USB-A ports to charge your phone or laptop when stranded.

    Its rugged, weather-resistant design ensures reliable performance whether you’re stuck in the snow, off-road, or in the dark.

    Keep it in your car, truck, or boat so you’re always ready for the unexpected.

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    Sworn by Over 10,000 Trusted Drivers

    4.8

    / 5

    based on 15,466 reviews

    Started my diesel truck like nothing.

    “The GBX155 saved me in the middle of winter. Jump-started my F-350 in seconds — and saved money by avoiding AAA. Absolutely worth it.” “The GBX155 saved me in the middle of winter. Jump-started my F-350 in seconds — and saved money by avoiding... “The GBX155 saved me in the middle of winter. Jump-started my F-350 in seconds — and saved money by avoiding AAA. Absolutely worth it.”

    Alex M. ✓ Verified Customer

    The power is unreal!

    “I didn’t believe it could actually jump my 8-liter diesel… but it did. Starts faster than my old shop unit and fits right in my glove box.” “I didn’t believe it could actually jump my 8-liter diesel… but it did. Starts faster than my old shop unit... “I didn’t believe it could actually jump my 8-liter diesel… but it did. Starts faster than my old shop unit and fits right in my glove box.”

    Brian S. ✔ Verified Customer

    Saved me on the highway!

    “My car died at night on the side of the road. Used the flashlight to see, hooked it up, and boom — engine started instantly. Worth every penny.” “My car died at night on the side of the road. Used the flashlight to see, hooked it up, and... “My car died at night on the side of the road. Used the flashlight to see, hooked it up, and boom — engine started instantly. Worth every penny.”

    Ashley D. ✔ Verified Customer

    Every driver needs this.

    “I bought one for my car and another for my husband’s truck. It’s powerful, compact, and charges our phones too. We never travel without it now.” “I bought one for my car and another for my husband’s truck. It’s powerful, compact, and charges our phones too.... “I bought one for my car and another for my husband’s truck. It’s powerful, compact, and charges our phones too. We never travel without it now.”

    Rachel S. ✓ Verified Customer

    Built tough — feels pro-grade.

    “This isn’t a gimmick. The clamps are solid, the light’s bright, and it even jump-started my tractor. Best purchase I’ve made all year.” “This isn’t a gimmick. The clamps are solid, the light’s bright, and it even jump-started my tractor. Best purchase I’ve... “This isn’t a gimmick. The clamps are solid, the light’s bright, and it even jump-started my tractor. Best purchase I’ve made all year.”

    Mark D. ✓ Verified Customer

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