Rexing - 4000A Jump Starter, 12V Car Battery Booster with 65W Quick Charger
Customers are saying
Customers commend the product for its impressive charging speed, reliable overall performance, and highly portable design. Users also appreciate the clear LCD display, effective jump-starting capabilities, and the convenience of the included flashlight and carrying case. While the device is generally well-regarded, some users noted that it is slightly larger than expected.
Features
24000mAh & 4000A Peak Power
Equipped with a powerful 24000mAh battery, the RJ4000 jump starter quickly revives 12V vehicles including cars, trucks, boats, and more, supporting gasoline and diesel engines up to 10 liters.
HD LCD Display
The clear LCD screen shows real-time status indicators, making it easy to monitor battery level and operational status at a glance.
65W USB-C Fast Charging
Features a 65W USB-C in/out port and a QC3.0 USB-A port. Fully recharges in just 1.3 hours and powers devices such as phones, laptops, and tablets—perfect for travel and camping.
One-Touch Boost & Multi-Mode LED Light
Start vehicles in low-voltage conditions with one touch. Built-in LED flashlight includes SOS, strobe, and steady light modes for emergencies.
Durable & Certified Safe
Operates from -4°F to 140°F, IP64 water-resistant and dustproof. Certified to FCC, CE, ROHS, and UN38.3 safety standards. Includes 12-month warranty and responsive customer support.
Specifications
- BrandRexingModel NumberBBY-RJ4000Product Name4000A Jump Starter, 12V Car Battery Booster with 65W Quick ChargerAmperage4000Voltage12Charger TypeAC, DC
Reviews
Rating 5 out of 5 stars with 131 reviews
- Charging Speed (43)
- Overall Performance (39)
- Portability (38)
- Display (28)
- Jump Starting Performance (14)
- Size (6)
Customer Images
The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.
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The Rexing RJ4000 4000A Jump Starter is a high-performance portable battery pack designed for reliable vehicle starting in any situation. With a 24000mAh capacity and 4000A peak current, it jump starts gasoline and diesel engines up to 10 liters, covering cars, SUVs, trucks, boats, and more. The HD LCD display keeps you informed about battery level and operational status, while 65W USB-C fast charging and a QC3.0 USB-A port make it a versatile power bank for phones, tablets, laptops, and other electronics. Its one-touch boost feature helps start vehicles in low-voltage emergencies, and the multi-function LED flashlight with SOS, strobe, and steady modes adds safety in the dark. Built to endure tough conditions, the RJ4000 operates from -4°F to 140°F, is IP64 water-resistant, and meets FCC, CE, ROHS, and UN38.3 safety certifications. Backed by a 12-month warranty and responsive customer support, the RJ4000 is your trusted travel and emergency companion.

This WOLFBOX JS24 car jump starter provides up to 4000A peak current and 24000mAh high capacity. It can safely start gas and diesel engines. Works on all (12 volt) cars, trucks, boats and large vehicles, meanwhile it is very portable. The JS24 battery jump starter works with a smart jumper clip to provide 10 safety protections to ensure safe use. The JS24 car jump starter power supply contains an LED screen that clearly displays all status indicators of the portable car jump starter power supply. You can easily identify the current status of your emergency power source and provide seamless access to all functions. This JS24 car jumper is also equipped with 1*65W Type-C input/output port and 1*QC 3.0 USB-A port, which can save 50 when charging your mobile phone, tablet, Kindle or digital camera 50% time. Tips:A 65W charging plug needs to be purchased separately.

The Rexing RJ21 2-in-1 Jump Starter is your all-in-one roadside companion, combining a jump starter & tire inflator in one portable device. With 1500A peak current and a 12000mAh capacity, it can jump start gasoline engines up to 6 liters and diesel engines up to 3 liters, making it ideal for cars, motorcycles, SUVs, ATVs, and small boats. The integrated 150 PSI tire inflator quickly restores tire pressure for cars, bikes, and motorcycles, while the air blower function is perfect for cleaning or inflating sports equipment. A 150-lumen LED flashlight ensures you have light during night repairs or roadside emergencies, and USB-C input (5V/2A) plus USB output (5V/2A) keep your devices powered on the go. Compact, durable, and versatile, the RJ31 is built for both everyday convenience and unexpected emergencies—whether on the road, at home, or outdoors.

The AVAPOW 6000A jump starter features a 32000mAh high-capacity battery, designed to start all 12V gasoline engines and up to 12L diesel engines. It also works as a portable power bank with dual USB fast charging and DC output. Built-in LED flashlight with SOS, strobe, and steady modes ensures safety in emergencies, travel, and outdoor use. Compact and powerful for roadside and camping needs.
| Pros for Rexing - 4000A Jump Starter, 12V Car Battery Booster with 65W Quick Charger | |||
|---|---|---|---|
| Charging Speed, Overall Performance, Portability, Display, Jump Starting Performance | Overall Performance, Charging Speed, Ease of Use, Battery Life, Size | Portability, Overall Performance, Jump Starter Performance, Air Compressor Performance | Portability, Starting Performance |
| Cons for Rexing - 4000A Jump Starter, 12V Car Battery Booster with 65W Quick Charger | |||
| Size | There were no cons for this product— | There were no cons for this product— | There were no cons for this product— |















































