Rexing USA
Démarreur de secours Rexing 4000 A, booster de batterie de voiture 12 V avec chargeur rapide 65 W, écran LED, batterie portable 24 000 mAh pour moteurs essence 10 L/diesel 10 L avec éclairage LED et câbles de démarrage.
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Puissance de crête de 24 000 mAh et 4 000 A – Équipé d'une puissante batterie de 24 000 mAh, le démarreur RJ4000 relance rapidement les véhicules 12 V, notamment les voitures, les camions, les bateaux, etc., prenant en charge les moteurs à essence et diesel jusqu'à 10 litres.
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Écran LCD HD – L’écran LCD clair affiche des indicateurs d’état en temps réel, ce qui facilite la surveillance du niveau de la batterie et de l’état de fonctionnement en un coup d’œil.
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Charge rapide USB-C 65 W – Doté d'un port USB-C 65 W et d'un port USB-A QC3.0. Recharge complète en seulement 1,3 heure et alimente des appareils tels que téléphones, ordinateurs portables et tablettes, idéal pour les voyages et le camping.
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Boost à une touche et éclairage LED multimode – Démarrez votre véhicule en cas de basse tension d'une simple pression. La lampe torche LED intégrée offre les modes SOS, stroboscopique et fixe pour les urgences.
- Durable et certifié sûr – Fonctionne de -20 °C à 60 °C, indice de résistance à l'eau et à la poussière IP64. Certifié conforme aux normes de sécurité FCC, CE, ROHS et UN38.3. Garantie de 12 mois et service client réactif inclus.
READY WHEN THE ENGINE ISN’T
PEAK STARTING CURRENT
Bring the power.
Get moving again.
A flat battery can interrupt an ordinary day. Keep the RJ4000 close for a portable jump-start solution for compatible cars, trucks, boats and other 12V vehicles.
Use only with compatible 12V systems. Jump-start performance varies with battery condition, engine size and temperature. Follow the vehicle and jump-starter manuals.

POWER THAT WORKS BOTH WAYS
Start the car.
Charge your day.
Put its 24,000mAh battery to work beyond the engine bay. USB-C Power Delivery supplies up to 65W to compatible phones, tablets and laptops, then recharges the jump starter through the same port.
Charging speed depends on the adapter, cable, device and battery level. Wall adapter not included.
CLEAR INFORMATION. USEFUL LIGHT.
See the status.
Light the next step.
The LCD brings battery percentage, charging power and operating indicators together in one clear view. When daylight runs out, switch on the built-in LED.
Designed for low-voltage starting situations. Check the manual and screen prompts before use.


BUILT FOR ROADSIDE CONDITIONS
Ready for more
than fair weather.
IP64 dust and splash resistance and an operating range from −4°F to 140°F support use across changing conditions.
Splash-resistant, not submersible. Observe the operating and storage guidance in the manual.
PACKED TO STAY TOGETHER
One case.
Road-ready essentials.
Keep the jump starter and its accessories organized in the included carry case, ready to take along when you head out.
- 01RJ4000 jump starter
- 02Battery clamps / jumper cables
- 03USB-C to USB-C and USB-A to USB-C cables
- 04Carry case, user manual and safety guide
12-month limited warranty. A wall charging adapter is not included.

THE DETAILS THAT MATTER
Everything
at a glance.
Jump-starting & vehicle compatibility
- Model
- Rexing RJ4000
- Peak starting current
- 4000A
- Vehicle electrical system
- 12V only
- Gasoline engines
- Up to 12L
- Diesel engines
- Up to 9L
- Before jump-starting
- Charge the unit above 50%; follow the user manual
Battery, charging & connections
- Battery capacity
- 24,000mAh / 88.8Wh
- USB-C input / output
- Up to 65W Power Delivery
- USB-C profiles
- 5V/3A, 9V/3A, 12V/3A, 15V/3A, 20V/3.25A
- USB-A outputs
- 2 × QC 3.0 ports
- Other connections
- DC output and EC5 jumper-cable port
- Wall charging adapter
- Not included; compatible PD adapter required for fast charging
Display, lighting & protection
- LCD information
- Battery percentage, power input/output and status indicators
- LED modes
- Steady light, SOS and strobe
- Operating temperature
- −4°F to 140°F / −20°C to 60°C
- Environmental rating
- IP64 dust and splash resistance
- Protective functions
- Reverse polarity, short circuit, overcurrent and temperature monitoring
- BOOST mode
- For low-voltage starting; follow the manual and display prompts
Before your first use
Fully charge the RJ4000 before its first use and keep the battery above 50% before jump-starting. Read the supplied safety guide and the instructions for your vehicle.
Use the included clamps and follow the LCD prompts. If the unit signals an error, stop and check the troubleshooting guide before trying again.
Read the complete instructions ↗CUSTOMER RATINGS ON BEST BUY
Confidence, backed
by owners.
“The LCD display is easy to read.”
“I connected the Rexing Jump Start and it cranked right up!”
Source: Best Buy, model BBY-RJ4000, SKU 6680262. Rating snapshot checked September 8, 2026; counts and ratings may change. These are selected external review excerpts, not reviews submitted on Rexing.com. Reviewer labels are retained from Best Buy; both selected reviews are marked as incentivized. Individual experiences vary.
REXING RJ4000
