NOCO GBX45 vs GBX55: Which Boost X Is Right for You?
Quick Answer: The NOCO GBX55 is the better jump starter for trucks, large SUVs, boats, and diesel engines — it delivers 1,750 amps and handles engines up to 7.5L gas and 5.0L diesel. The NOCO GBX45 is the smarter buy for everyday cars and motorcycles — it offers 1,250 amps at $124.95, saving you $50 over the GBX55. Both are from the same Boost X series, share UltraSafe 2.0 protection, and recharge in under 5 minutes to jump-start a dead battery.
You’ve narrowed it down to two NOCO jump starters. The GBX45 and the GBX55 look nearly identical in photos. They’re the same brand, the same series, and both have great reviews. So which one do you actually need?
I’m Alex Rahman, and I’ve tested and reviewed portable jump starters for years. The difference between these two isn’t just amps on a spec sheet. It comes down to your engine size, how often you’ll use it, and whether that $50 price gap makes sense for your situation.
By the end of this article, you’ll know exactly which one to buy — no guessing.
- The GBX55 wins on raw power with 1,750 amps — 500 more than the GBX45.
- The GBX45 is the best value at $124.95 — perfect for cars, small trucks, and motorcycles.
- The GBX55 covers bigger engines: 7.5L gas and 5.0L diesel vs 6.5L gas and 4.0L diesel.
- The GBX55 gives you up to 9 jump starts per charge; the GBX45 gives up to 6.
- Both share the same UltraSafe 2.0 safety system, 60W USB-C charging, and 5-minute emergency charge.
| Category | GBX45 | GBX55 |
|---|---|---|
| Overall Winner | — | 🏆 |
| Best Value | ✅ | ❌ |
| Best Performance | ❌ | ✅ |
| Best For Beginners | ✅ | ✅ |
| Best for Cold Weather / Diesel | ❌ | ✅ |
Product Overview: NOCO GBX45 Boost X 1250A Jump Starter
| ✅ Best for | Everyday car owners, commuters, motorcycle riders, and small truck drivers who want pro-level safety at the lowest price in the Boost X lineup. |
| ❌ Not ideal for | Diesel engines over 4.0L, large gas engines over 6.5L, or fleet workers needing 7+ jump starts per charge — consider the GBX55 instead. |
| 💰 Price | ~$124.95 (check for latest price) |
The NOCO GBX45 is the smaller sibling in the Boost X family. It delivers 1,250 peak amps — enough to start gas engines up to 6.5 liters and diesel engines up to 4.0 liters. That covers the vast majority of everyday passenger vehicles on the road.
It weighs just 2.16 lbs with clamps attached. That’s lighter than most laptops. It easily fits in a glovebox, center console, or a backpack side pocket. For most drivers, this is the only jump starter they’ll ever need.
The GBX45 uses the same UltraSafe 2.0 technology as every other Boost X model. That means spark-proof connections and reverse polarity protection built right in. Even if you’ve never jump-started a car before, it’s hard to make a dangerous mistake. The unit also recharges from dead to jump-ready in just 5 minutes — or fully in 48 minutes using a 60W USB-C charger.
At $124.95, the GBX45 is the entry point of the Boost X series. It’s the jump starter for drivers who want NOCO’s best safety technology without overpaying for power they don’t need.
NOCO Boost X GBX45: 1250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack, Portable Jump Box, Power Bank & Jumper Cables – for 6.5L Gas and 4.0L Diesel Engines
The GBX45 is the right buy if your vehicles are everyday passenger cars, compact SUVs, or motorcycles — it delivers everything you need at the best price in the Boost X lineup.
Product Overview: NOCO GBX55 Boost X 1750A Jump Starter
| ✅ Best for | Truck owners, RV drivers, boaters, and fleet users with larger gas engines or diesels up to 5.0L who need more amps and more jump starts per charge. |
| ❌ Not ideal for | Budget buyers with a small passenger car — the GBX45 handles that job perfectly and saves you $50. Heavy commercial diesels over 5.0L need the GBX75 ($249.95) instead. |
| 💰 Price | ~$174.95 (check for latest price) |
The NOCO GBX55 is the step-up model in the Boost X family. It delivers 1,750 peak amps — 500 more than the GBX45. That extra power matters when you’re dealing with a 7.5L gas engine or a 5.0L diesel truck in freezing temperatures.
The GBX55 packs a 46Wh lithium battery — that’s 15Wh more than the GBX45. More capacity means more jump starts. NOCO rates the GBX55 for up to 9 jump starts per charge. If you’re a fleet manager, a road trip adventurer, or someone who helps others frequently, those extra starts make a real difference.
It also ships with a brighter 200-lumen flashlight. That’s double the output of the GBX45’s 100-lumen light. At night, on the side of a dark road, that brightness matters. The GBX55 recharges fully in 1.2 hours via 60W USB-C — slightly longer than the GBX45 due to its bigger battery, but still impressively fast.
At $174.95, the GBX55 costs $50 more than the GBX45. For truck and diesel owners, that’s money well spent.
NOCO Boost X GBX55: 1750A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack, Portable Jump Box, Power Bank & Jumper Cables – for 7.5L Gas and 5.0L Diesel Engines
The GBX55 is the right buy if you drive a large truck, tow a boat, or need confident starts on diesel engines — the extra amps and larger battery pay off every time you use it.
Full Spec Comparison: NOCO GBX45 vs GBX55
| Spec | GBX45 | GBX55 | Winner |
|---|---|---|---|
| Peak Current | 1,250A | 1,750A | GBX55 |
| Gas Engine Capacity | Up to 6.5L | Up to 7.5L | GBX55 |
| Diesel Engine Capacity | Up to 4.0L | Up to 5.0L | GBX55 |
| Battery Capacity (Wh) | 31 Wh | 46 Wh | GBX55 |
| Jump Starts Per Charge | Up to 6 | Up to 9 | GBX55 |
| LED Flashlight (Lumens) | 100 Lumens | 200 Lumens | GBX55 |
| Weight (with clamps) | 2.16 lbs | 2.58 lbs | GBX45 |
| Charging Time (Standard / 10W) | ~4 hours | ~7.2 hours | GBX45 |
| Charging Time (Fast / 60W USB-C) | 48 minutes | 1.2 hours | GBX45 |
| Emergency Charge (0% to jump) | 5 minutes | 5 minutes | Tie |
| USB-C Output Power | 60W | 60W | Tie |
| IP Rating | IP65 | IP65 | Tie |
| Manual Override | Yes | Yes | Tie |
| UltraSafe 2.0 | Yes | Yes | Tie |
| Cold Weather Operation | -4°F to 122°F | -4°F to 122°F | Tie |
| Warranty | 1-Year | 1-Year | Tie |
| Price (MSRP) | $124.95 | $174.95 | GBX45 |
Raw Power: GBX45 vs GBX55 — Which Starts More Engines?
The GBX55 wins this category. It delivers 1,750 peak amps vs the GBX45’s 1,250 amps. That’s 500 more amps with every single start.
In practical terms, the GBX45 handles gas engines up to 6.5 liters and diesels up to 4.0 liters. That covers most cars, compact SUVs, and light pickups. The GBX55 stretches that to 7.5L gas and 5.0L diesel. That unlocks full-size trucks like the Ford F-250 with its 6.7L Power Stroke diesel, large V8 SUVs, and RV engines.
The battery capacity difference matters too. The GBX55 packs 46Wh vs the GBX45’s 31Wh. More capacity means more cranking power delivered per attempt. On a severely dead battery in cold weather, that extra capacity can be the difference between a start and a stall.
One real-world account from a GBX55 user sums it up well — they used it on a jeep that had been sitting in the mountains for three months in freezing cold, with the battery down to just 2 cold-cranking amps. The GBX55 fired it up on the first try using Manual Override. The GBX45 would likely have struggled with that scenario given the diesel-range battery depletion.
The GBX55 wins on power. If your vehicle has an engine over 6.5L gas or 4.0L diesel, the GBX55 is the only safe choice here. For everything under those limits, the GBX45 delivers all the power you need.
Portability and Design: GBX45 vs GBX55 — Which Is Easier to Carry?
The GBX45 wins on portability. It’s lighter and more compact than the GBX55.
The GBX45 weighs 2.16 lbs with clamps. The GBX55 weighs 2.58 lbs. That’s less than half a pound of difference — but when you’re cramming something into a small glovebox or center console, every inch matters. The GBX45 measures 6.83″ x 3.28″ x 2.08″. The GBX55 is slightly wider and taller at 7.66″ x 4.90″ x 2.50″.
Both units have the same clean, rugged Boost X design. The build quality is solid on both. They both feel premium, not flimsy. Both ship with heavy-duty precision battery clamps, a USB-C cable, and a microfiber storage bag. Neither comes with the 60W USB-C charging brick — you’ll need to supply your own.
One honest complaint that appears on Amazon reviews for both models: the jumper cables feel short. Several buyers wish for a few extra inches of reach. This isn’t a dealbreaker, but it’s worth knowing before you buy. Position the jump starter carefully near the battery terminal before connecting.
When using either model, place the jump starter on top of the engine bay or near the battery before attaching the clamps. The cables are long enough to reach most standard battery positions when the unit is properly placed — don’t let it hang from a distance.
Price and Value: GBX45 vs GBX55 — Is the $50 Difference Worth It?
The GBX45 wins on value — for most drivers. The GBX55 wins on value — for truck and diesel owners.
The price gap is exactly $50. The GBX45 is $124.95 and the GBX55 is $174.95. Both are priced at MSRP directly from NOCO. Amazon pricing may vary slightly, so check the current price before purchasing.
Here’s how to think about that $50: if your vehicle has an engine under 6.5L gas or 4.0L diesel, you’re paying $50 extra for specs you’ll never use. The GBX45 will handle every start reliably. Save the money.
But if you drive a large truck, an RV, or a diesel SUV, the GBX55 is the value play. A failed jump start on the side of the highway costs far more than $50 in towing fees and time. The GBX55 covers every scenario the GBX45 can’t. For those buyers, $174.95 is the smarter investment.
Think of it this way: the GBX45 is the right tool for 70% of drivers. The GBX55 is the right tool for the other 30% — the ones with bigger engines and bigger stakes.
Safety Features and Unique Tools: GBX45 vs GBX55 — What Protects You?
Both models tie on core safety. They both share UltraSafe 2.0, Manual Override, and a 4-LED diagnostic system. Here’s what each one means in practice.
UltraSafe 2.0 means you can’t accidentally spark the clamps by connecting them in the wrong order. If you hook up the cables backwards, the unit detects reverse polarity and locks out. It won’t allow a connection. This is a big deal for new users who’ve never jumped a battery before.
Manual Override is the most misunderstood feature on both models. It allows you to force the jump start on a battery below 3 volts — when the unit can’t detect a live battery signal. This sounds useful, and it is. But use it carefully.
Manual Override bypasses the safety protections built into UltraSafe 2.0. Using it on a battery that is physically damaged, leaking, or cracked can cause an explosion, fire, or serious injury. Only use Manual Override when you are confident the battery is intact but simply over-discharged. Never use it repeatedly or as a shortcut — it is an emergency-only feature.
The 4-LED diagnostic system on both models tells you what’s happening in real time. You get indicators for Reverse Polarity, Overheating, Cold (too cold to operate), and Fast Charge status. These were absent on older NOCO GB-series models — they’re a major upgrade that both the GBX45 and GBX55 share equally.
One difference worth noting: the GBX55’s brighter 200-lumen flashlight provides much better visibility at a nighttime breakdown. The GBX45’s 100-lumen light is functional but noticeably dimmer side by side. Neither model has a built-in voltmeter — both show charge status via LED indicators only, not a numerical voltage readout.
Both models are equally safe for everyday use. Neither has a built-in voltmeter. The GBX55 edges ahead with its brighter flashlight — useful at night roadside repairs. For Manual Override, treat it as an emergency-only tool on both models.
Real-World Use Cases: Which Boost X Wins Your Situation?
- Sedan or compact SUV dead in a parking lot: GBX45 wins. 1,250 amps handles any 4- or 6-cylinder engine. Saves you $50 over the GBX55 for a job it handles perfectly.
- Ford F-250 with 6.7L Power Stroke diesel: GBX55 wins. The GBX45 is not rated for this engine. The GBX55’s 5.0L diesel rating covers most heavy-duty pickups.
- Cold morning start — vehicle parked outside all winter: GBX55 wins. Its larger 46Wh battery delivers more cranking energy when the battery is cold-soaked and sluggish.
- Motorcycle rider wanting a pocketable emergency tool: GBX45 wins. Lighter, more compact, perfectly rated for any bike engine. The GBX55’s extra size isn’t worth it here.
- Fleet manager jumping multiple vans per day: GBX55 wins. Up to 9 jump starts per charge vs 6 on the GBX45 means fewer recharges during a working shift.
- Boat owner with a large V8 outboard motor: GBX55 wins. Higher amp output and bigger battery handle large marine engines with confidence.
Who Should Buy the NOCO GBX45?
- You drive a car, compact SUV, or motorcycle — engines under 6.5L gas or 4.0L diesel
- You want the lightest, most portable jump starter in the Boost X lineup
- Budget matters — you want NOCO’s best safety tech at the lowest Boost X price
- You mostly do one or two jump starts at a time and recharge in between
- You want the fastest full recharge — 48 minutes is 30 minutes faster than the GBX55
Who Should Buy the NOCO GBX55?
- You drive a full-size truck, RV, or boat with an engine over 6.5L gas or a diesel over 4.0L
- You need more jump starts per charge — up to 9 vs 6 on the GBX45
- You deal with cold weather starts where battery power is critical
- You’re a fleet worker or roadside helper who jumps multiple vehicles frequently
- You want a brighter flashlight — 200 lumens vs 100 lumens for nighttime breakdowns
Who Should NOT Buy Either One?
- You drive a small 4-cylinder car and only need occasional jump starts — the NOCO GB40 ($99.95) handles that job for $25 less than the GBX45 and works well for everyday use.
- You run a semi-truck, mining equipment, or construction diesel over 5.0L — the GBX55 isn’t rated for that. You need the NOCO GBX75 ($249.95) or the GBX155 ($369.95) for those applications.
- You want a built-in voltmeter to read your battery’s actual voltage number — neither model has one. You’d need a separate battery tester for that diagnostic feature.
How to Maintain Your Boost X Jump Starter
A jump starter you never charge when you need it is just dead weight. Build the habit of charging it on the first of every month — it only takes 48 minutes for the GBX45 and 1.2 hours for the GBX55. Your future self will thank you.
Charge your jump starter at least once a month, even if you haven’t used it. Lithium batteries lose charge naturally over time. A unit left uncharged for three to four months may lose 20-40% of its capacity before you even start.
Store your Boost X away from extreme heat. Temperatures above 104°F (40°C) accelerate lithium battery degradation. Don’t leave it on the back seat of a car in summer. A cool, dry indoor location is ideal for long-term storage.
Never let the battery stay deeply discharged for extended periods. If your Boost X reads one LED or less, charge it within a week. Deep discharges shorten the lifespan of any lithium battery.
Do not use Manual Override repeatedly on consecutive attempts. Repeated use forces maximum output without the safety circuit active — this stresses the internal battery and can shorten its lifespan significantly. Manual Override is for emergency-only use, not routine jump-starting.
After multiple jump starts on a large engine, recharge the unit promptly. Don’t toss it back in the glovebox at half charge. Both the GBX45 and GBX55 recharge quickly — 48 minutes and 1.2 hours respectively — so there’s no excuse to leave them depleted.
Final Verdict: NOCO GBX45 vs GBX55 — Which One Wins?
The NOCO GBX55 is the overall winner — but the GBX45 is the smarter choice for most drivers.
If you drive a standard car, compact SUV, or motorcycle, buy the GBX45 at $124.95. It handles everything you need and saves you $50 over the GBX55. If you own a large truck, RV, boat, or diesel over 4.0L, the GBX55 at $174.95 is worth every dollar of the difference.
Both models deliver NOCO’s best safety technology and the same 5-minute emergency charge. The GBX55 just brings more power, more battery, and more starts per charge to the table — for buyers who actually need those things. As I always say: match the tool to the job, not the other way around.
NOCO Boost X GBX45: 1250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
Best for everyday cars — the most portable and best-value jump starter in the Boost X lineup.
NOCO Boost X GBX55: 1750A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
Best for trucks, RVs, and diesels — the step-up Boost X that handles engines everyday jump starters can’t touch.
Frequently Asked Questions
I’m Alex Rahman, a car enthusiast and automotive writer focused on practical solutions, car tools, and real-world driving advice. I share simple and honest content to help everyday drivers make better decisions.