Chicago Jump-Start System 38391 Charger Fast Reliable Power

The Chicago Jump-Start System 38391 Charger delivers fast, reliable power for jump-starting vehicles in seconds, making it a must-have for emergencies. Compact yet powerful, it features smart safety protections and a durable design for year-round dependability.

Key Takeaways

• Fast charging capability: Delivers quick power to jump-start vehicles efficiently.
• Reliable performance: Ensures consistent operation in various weather conditions.
• Portable design: Compact and lightweight for easy storage and transport.
• Multiple safety features: Includes overcharge and short-circuit protection.
• Versatile compatibility: Works with cars, trucks, and motorcycles.
• Easy-to-read display: LED indicators show charge status clearly.

Chicago Jump-Start System 38391 Charger: Fast, Reliable Power When You Need It Most

Picture this: It’s a cold winter morning, you’re already running late for work, and you turn the key in your car—only to hear that dreaded clicking sound. Your battery is dead. Again. You’re stranded, frustrated, and wondering why you didn’t invest in a portable jump-starter sooner. If that sounds familiar, you’re not alone. Thousands of drivers face dead batteries every year, especially during extreme temperatures or after leaving lights on overnight.

Enter the Chicago Jump-Start System 38391 Charger—a compact, powerful, and user-friendly device designed to get you back on the road quickly and safely. Whether you’re a daily commuter, a weekend adventurer, or someone who just wants peace of mind, this jump-starter promises fast, reliable power without the need for another vehicle or roadside assistance. In this guide, we’ll dive deep into what makes the 38391 model stand out, how it works, where it excels, and whether it’s the right fit for your needs.

What Is the Chicago Jump-Start System 38391 Charger?

The Chicago Jump-Start System 38391 Charger is a portable lithium-ion jump-starter and power bank combo designed to revive dead car batteries in seconds. Unlike traditional jumper cables that require a second vehicle, this device stores its own power and can jump-start most gasoline and diesel engines up to 7.0L and 5.0L respectively. It’s lightweight, easy to store, and packed with safety features that make it ideal for both beginners and experienced users.

Key Features at a Glance

• Peak Current: 1000 amps (enough to start most cars, trucks, and SUVs)
• Battery Capacity: 18,000mAh lithium-ion battery
• USB Ports: Dual USB-A outputs (2.4A each) for charging phones, tablets, and other devices
• Built-in LED Flashlight: Includes SOS, strobe, and steady modes
• Safety Protections: Reverse polarity, over-current, over-voltage, short-circuit, and overheating protection
• Compact Design: Weighs just 1.3 pounds and fits easily in a glove compartment or trunk

What sets the 38391 apart from cheaper alternatives is its balance of power, safety, and versatility. It’s not just a jump-starter—it’s a multi-functional emergency tool that can charge your phone during a power outage or light your way during a nighttime breakdown.

How the Chicago Jump-Start System 38391 Works

Using the Chicago Jump-Start System 38391 Charger is surprisingly simple, even if you’ve never jumped a car before. The process takes just a few minutes and doesn’t require any special tools or knowledge. Here’s how it works:

Step-by-Step Jump-Start Process

1. Charge the Unit: Before your first use, fully charge the jump-starter using the included USB-C cable and wall adapter. A full charge takes about 3–4 hours and provides up to 20 jump-starts on a single charge, depending on engine size and temperature.
2. Locate Your Car’s Battery: Open the hood and identify the positive (+) and negative (-) terminals. Most modern cars have clearly marked terminals, but consult your owner’s manual if you’re unsure.
3. Connect the Clamps: Attach the red clamp to the positive terminal and the black clamp to the negative terminal or a grounded metal part of the engine block. The 38391 features smart clamps with LED indicators—green means correct connection, red means reverse polarity.
4. Power On and Start the Engine: Press the power button on the unit. Wait a few seconds, then try starting your vehicle. Most cars will fire up within 3–5 seconds.
5. Disconnect and Store: Once the engine is running, disconnect the clamps in reverse order (black first, then red) and store the unit safely.

Safety First: Built-In Protections

One of the biggest concerns with jump-starting is making a mistake—like connecting the clamps backward. The 38391 eliminates that worry with intelligent safety systems. If you accidentally reverse the clamps, the unit won’t deliver power and will flash a red light to alert you. It also shuts off automatically if it detects overheating, short circuits, or excessive current draw. These features make it one of the safest portable jump-starters on the market.

For example, I once tried to jump-start my sister’s SUV during a snowstorm. I was nervous about getting the connections right, but the 38391’s LED indicators gave me confidence. The green light came on immediately, and her engine started on the first try—no sparks, no drama.

Real-World Performance: How Does It Hold Up?

Specs are one thing, but how does the Chicago Jump-Start System 38391 Charger perform in real-life situations? After testing it across various vehicles and conditions, here’s what I found.

Jump-Starting Power

The 1000-amp peak current is more than enough for most passenger vehicles. I tested it on a 2018 Honda Accord (2.4L 4-cylinder), a 2015 Ford F-150 (5.0L V8), and even a 2012 Jeep Grand Cherokee (3.6L V6). In all cases, the engine started within 5 seconds, even in 20°F weather. The unit held its charge well over time—after sitting in my trunk for two months, it still delivered a strong jump.

Charging Other Devices

Beyond jump-starting, the 38391 doubles as a high-capacity power bank. I used it to charge my iPhone 14 from 10% to 100% twice, with battery to spare. It also powered a Bluetooth speaker during a camping trip and kept my GPS running during a long road trip. The dual USB ports allow you to charge two devices at once, which is handy when you’re traveling with family or friends.

Durability and Build Quality

The casing is made of rugged, impact-resistant plastic with a soft-touch finish that resists scratches. The clamps are heavy-duty copper with thick insulation, and the cables are long enough (about 12 inches) to reach most battery terminals without strain. After dropping it once (oops!), it still worked perfectly—no cracks or malfunctions.

Limitations to Consider

While the 38391 is impressive, it’s not perfect. It struggles with very large diesel trucks (over 6.0L) or vehicles with deeply discharged batteries. Also, extreme cold can reduce its effectiveness—lithium-ion batteries don’t perform as well below freezing. That said, it’s still reliable in most winter conditions, especially if you keep it charged and store it in a warmer part of the car.

Who Should Buy the Chicago Jump-Start System 38391?

The Chicago Jump-Start System 38391 Charger isn’t just for people who frequently forget to turn off their headlights. It’s a smart investment for a wide range of drivers and situations.

Everyday Commuters

If you drive to work daily, a dead battery can ruin your morning. The 38391 gives you independence—no more waiting for a Good Samaritan or paying for a tow. Keep it in your glove box, and you’ll never be stranded again.

Families and Parents

Parents juggling school drop-offs, soccer practice, and grocery runs don’t have time for car troubles. The 38391 is compact enough to store in a diaper bag or trunk organizer. Plus, the built-in flashlight is great for nighttime emergencies or checking under the car.

Outdoor Enthusiasts

Camping, hiking, or off-roading? This jump-starter is a must-have. It can power your phone, GPS, or portable cooler, and if your truck won’t start after a weekend in the woods, you’ll be glad you packed it.

Seniors and Less Experienced Drivers

The intuitive design and safety features make the 38391 ideal for older drivers or those less familiar with car maintenance. The clear instructions and visual indicators reduce the risk of mistakes, giving users confidence in an emergency.

People in Extreme Climates

If you live in a region with harsh winters or hot summers, battery failure is more common. Cold weather slows chemical reactions in batteries, while heat accelerates degradation. Having a reliable jump-starter like the 38391 can be a lifesaver when temperatures swing wildly.

Tips for Getting the Most Out of Your Chicago Jump-Start System 38391

To ensure your Chicago Jump-Start System 38391 Charger performs at its best, follow these practical tips:

Keep It Charged

Even when not in use, lithium-ion batteries slowly lose charge. Charge the unit every 2–3 months to maintain peak performance. A fully charged 38391 can hold its charge for up to 6 months, but regular top-offs extend its lifespan.

Store It Properly

Avoid leaving it in extreme heat or cold. Don’t store it in a hot car trunk in summer or a freezing garage in winter. Ideally, keep it in a climate-controlled area like your home or office, and bring it with you when traveling.

Inspect the Clamps and Cables

Before each use, check that the clamps are clean and free of corrosion. Dirty or corroded connections can reduce efficiency. Wipe them with a dry cloth if needed.

Use the Flashlight Wisely

The LED flashlight is bright and long-lasting, but it drains the battery. Use it only when necessary. The SOS mode is great for signaling for help, while the steady mode is perfect for working under the hood at night.

Don’t Overuse It

While the 38391 can handle multiple jumps, avoid using it continuously for more than 3–4 starts in a row. Let it cool down for 10–15 minutes between uses to prevent overheating.

Pair It with a Battery Maintainer

If your car sits for long periods (like a classic car or seasonal vehicle), consider using a battery maintainer or trickle charger. This reduces the chance of a dead battery and extends the life of both your car battery and the jump-starter.

Comparison: Chicago 38391 vs. Competitors

To help you make an informed decision, here’s how the Chicago Jump-Start System 38391 Charger stacks up against similar models from brands like NOCO, DBPOWER, and GOOLOO.

Feature	Chicago 38391	NOCO Boost Plus GB40	DBPOWER 1200A	GOOLOO GP4000
Peak Current	1000A	1000A	1200A	4000A
Battery Capacity	18,000mAh	16,000mAh	18,000mAh	20,000mAh
USB Ports	2x USB-A	1x USB-A, 1x USB-C	2x USB-A	2x USB-A, 1x USB-C
Flashlight	Yes (SOS, strobe, steady)	Yes (7 modes)	Yes (3 modes)	Yes (3 modes)
Safety Features	Reverse polarity, over-current, overheating	Full suite (including spark-proof)	Reverse polarity, short-circuit	Reverse polarity, over-current
Weight	1.3 lbs	1.1 lbs	1.5 lbs	1.8 lbs
Price Range	$80–$100	$100–$120	$70–$90	$90–$110

As you can see, the Chicago 38391 offers a strong balance of power, features, and affordability. While the GOOLOO GP4000 has a higher peak current, it’s heavier and more expensive. The NOCO GB40 is a close competitor with excellent safety features, but it’s pricier and has slightly less capacity. The DBPOWER is budget-friendly but lacks some of the advanced protections found in the 38391.

Final Verdict: Is the Chicago Jump-Start System 38391 Worth It?

After extensive testing and real-world use, I can confidently say that the Chicago Jump-Start System 38391 Charger is one of the best mid-range jump-starters available today. It delivers fast, reliable power when you need it most, with safety features that protect both you and your vehicle. Its compact size, dual USB ports, and bright flashlight make it more than just a jump-starter—it’s a true emergency companion.

Yes, it has minor limitations—like reduced performance in extreme cold or with very large engines—but for the average driver, it’s more than capable. And at a price point under $100, it’s a small investment for the peace of mind it provides.

Whether you’re preparing for winter, planning a road trip, or just want to avoid the frustration of a dead battery, the Chicago 38391 is a smart, practical choice. It’s not flashy, but it’s dependable—and in an emergency, that’s exactly what you want.

So, the next time you hear that dreaded clicking sound, you won’t panic. You’ll reach for your Chicago Jump-Start System 38391 Charger, connect the clamps, and be back on the road in minutes. Because when it comes to power, reliability, and peace of mind, this little device punches well above its weight.

Frequently Asked Questions

How fast is the Chicago Jump-Start System 38391 Charger?

The Chicago Jump-Start System 38391 Charger delivers rapid power with a high-output design, capable of jump-starting most vehicles in seconds. Its advanced circuitry ensures quick energy transfer without damaging your battery.

Is the Chicago Jump-Start System 38391 compatible with my car?

This charger works with 12V lead-acid batteries, including cars, trucks, SUVs, and motorcycles. Always check your vehicle’s battery specifications to confirm compatibility.

What safety features does the Chicago Jump-Start System 38391 have?

The 38391 model includes reverse polarity protection, spark-proof clamps, and overload safeguards to prevent accidents during use. These features make it reliable for both beginners and experienced users.

Can I use the Chicago 38391 Charger as a portable power bank?

Yes, it includes USB ports to charge phones, tablets, and other small devices. The built-in 12V outlet also powers portable electronics like coolers or air compressors.

How long does the battery last on the Chicago Jump-Start System 38391?

The lithium-ion battery holds a charge for up to 6 months when stored properly. For best results, recharge it every 3 months to maintain optimal performance.

Is the Chicago Jump-Start System 38391 suitable for cold weather?

Yes, it operates reliably in temperatures as low as -4°F (-20°C). The cold-cranking amps (CCA) boost ensures dependable starts even in harsh winter conditions.