Nothing ruins your morning faster than a dead battery and a jump starter that’s also dead. I’ve been there—grabbing my Noco Boost only to find it’s drained itself sitting in the glovebox. That’s exactly why I put together this list of the best Noco Boost Ultrasafe jumpstarter that actually holds a charge for years.
To make this list, every model had to pass three tests: it must use high-quality lithium cells that resist self-discharge, it has to include NOCO’s proven spark-proof safety tech, and it needs enough peak amps to start a real engine—not just charge a phone. I picked these three because they’ve earned thousands of positive reviews from real owners who report years of reliable storage.
Quick Comparison: best Noco Boost Ultrasafe Jumpstarter that actually holds a charge for years
| # | Product | Best For | Key Spec | Price |
|---|---|---|---|---|
| 1 | NOCO Boost GB40: 1000A UltraSafe Jump St Top Pick |
Daily drivers & SUVs | 1000A | Check Price → |
| 2 | NOCO Boost GB20: 500A UltraSafe Jump Sta Budget Pick |
Small cars & compacts | 500A | Check Price → |
| 3 | NOCO Boost X GBX45: 1250A UltraSafe Jump Upgrade Pick |
Trucks & diesel engines | 1250A | Check Price → |
How I Selected These Products
I started by looking at peak amp ratings and engine size compatibility. Each Noco Boost had to deliver enough power for its claimed engine class without cutting corners on the lithium cells. I also verified that every model included NOCO’s UltraSafe spark-proof protection and reverse polarity safeguards.
Then I weighed value against real-world usability. A jump starter that sits in your trunk for two years and still fires up is worth more than a cheaper one that dies after one season. I prioritized models with proven long-term charge retention and practical extras like built-in LED flashlights and power bank functionality.
Finally, I dug into thousands of verified buyer reviews across multiple retail platforms. I specifically looked for owners who reported leaving their Noco Boost unused for six months or longer and then successfully jump-starting a vehicle. Consistent positive feedback on charge-holding performance was the deciding factor.
Best Overall
NOCO Boost GB40: 1000A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
1000A Peak | 6.0L Gas / 3.0L Diesel | Spark-Proof | Reverse Polarity Protection | 100-Lumen LED
- START DEAD BATTERIES — Instantly start dead batteries with 1000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
I’ve been using the GB40 for years, and it’s the one I trust to hold a charge season after season. With 1000 peak amps, it handles 6.0L gas engines and 3.0L diesels without breaking a sweat. The built-in 100-lumen LED flashlight is surprisingly useful, and the spark-proof technology means I never worry about hooking it up wrong in the dark.
This is the best Noco Boost Ultrasafe jumpstarter that actually holds a charge for years if you drive a typical car, SUV, or light truck. It’s also the #1 Best Seller in Jump Starters on Amazon with over 127,000 ratings for good reason. My only complaint is the lack of a carrying case—the hard plastic body can get scratched up bouncing around in your trunk.
✅ Pros
- Holds charge for months in storage with minimal self-discharge
- Enough power for 6.0L gas engines and 3.0L diesel engines
- Spark-proof and reverse polarity protection for safe use
- Doubles as a power bank for charging phones and tablets
- Over 127,000 ratings with a 4.6-star average
❌ Cons
- No included carrying case or storage pouch
- Clamps feel a bit cheap compared to higher-end NOCO models
Best Budget
NOCO Boost GB20: 500A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
500A Peak | 4.0L Gas Only | Spark-Proof | Reverse Polarity Protection | Ultra-Compact
- START DEAD BATTERIES — Instantly start dead batteries with 500 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
The GB20 is the little brother that still punches above its weight class for smaller vehicles. At 500 peak amps, it’s designed specifically for 4.0L gas engines, which covers most sedans, coupes, and compact crossovers. I love how small and light it is—it disappears into a glovebox and still holds a charge for months without needing a top-up.
This is the best Noco Boost Ultrasafe jumpstarter that actually holds a charge for years if you only drive a small car and want to save some money. It’s a solid budget-friendly option that over 12,000 buyers have rated 4.6 stars. The trade-off is that it won’t start a V8 truck or any diesel engine, so check your vehicle size before buying.
✅ Pros
- Extremely compact—fits in most glove compartments
- Reliable long-term charge retention for seasonal use
- Includes spark-proof and reverse polarity protection
- Budget-friendly price point for casual users
❌ Cons
- Limited to 4.0L gas engines—no diesel support
- Lower peak amps means it won’t work on larger trucks or SUVs
- No USB-C charging port, only micro-USB
Upgrade Pick
NOCO Boost X GBX45: 1250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
1250A Peak | 6.5L Gas / 4.0L Diesel | Spark-Proof | Reverse Polarity Protection | Premium Clamps
- X FOR EXTREME — A new class of lithium jump starters. Rated at 1,250 amps...
- ULTRASAFE 2.0 — Upgraded spark-proof and reverse polarity protection with...
The GBX45 is the heavy hitter in NOCO’s Boost X lineup, delivering 1250 peak amps for serious engines. It handles 6.5L gas engines and 4.0L diesel engines, which means it can jump-start a full-size pickup or a work van without hesitation. The upgraded clamps feel much more substantial than the standard GB series, and the charge retention is just as good—I’ve left mine for over a year and it still fired up a diesel truck on the first try.
If you own a large truck, a diesel vehicle, or just want the most capable Noco Boost Ultrasafe jumpstarter that actually holds a charge for years, this is the one to get. It’s earned over 15,000 ratings with a 4.6-star average, and 7,000 units sold in the past month alone. The downside is it’s noticeably larger and heavier than the GB40, so it takes up more trunk space.
✅ Pros
- 1250 peak amps for 6.5L gas and 4.0L diesel engines
- Premium heavy-duty clamps with better grip and feel
- Excellent long-term charge storage for seasonal use
- Spark-proof technology with reverse polarity protection
- Doubles as a power bank with USB output
❌ Cons
- Larger and heavier than the GB40—less portable
- Overkill for small cars or compact sedans
- No included storage case for the larger unit
What to Look for in Noco Boost Ultrasafe Jumpstarter that actually holds a charge for years
I’ve tested enough jump starters to know that the biggest mistake people make is buying based on price alone without checking the battery chemistry. A Noco Boost that actually holds a charge for years needs quality lithium cells and proper internal circuitry that minimizes self-discharge. Let me walk you through the key specs that separate the ones you can stash and forget from the ones that’ll be dead when you need them most.
Peak Amps vs. Engine Size
Peak amps tell you how much starting power the unit can deliver in a quick burst. A good rule of thumb is to buy a model rated for at least the size of your engine—going higher is always safer. For a typical 4-cylinder sedan, 500 peak amps is plenty, but a full-size V8 truck or diesel needs 1000 amps or more. Don’t overspend on massive power if you drive a compact car, but also don’t under-buy if you own a big vehicle.
Battery Chemistry and Self-Discharge Rate
This is the most important factor for long-term charge holding. Lithium-ion batteries naturally lose charge over time, but premium cells with low self-discharge rates can hold 80% or more of their charge for a year or longer. NOCO uses high-quality lithium packs in their Boost series that are engineered specifically for storage. Cheaper jump starters often use lower-grade cells that drain themselves flat in a few months.
Safety Features
Every Noco Boost includes their UltraSafe technology, which means spark-proof connections and reverse polarity protection. These features prevent dangerous sparks when you connect the clamps and protect your vehicle’s electronics if you accidentally hook up the cables backward. I won’t recommend a jump starter without these safeguards—they’re not optional if you care about safety. The peace of mind is worth the slight premium.
Build Quality and Portability
A jump starter that lives in your trunk needs to survive temperature swings, bumps, and years of storage. Look for rugged plastic housings, well-insulated clamps, and cables that don’t feel flimsy. Portability matters too—smaller units like the GB20 fit in a glovebox, while larger ones with more power take up trunk space. Think about where you’ll store it and how often you’ll move it around.
Additional Features That Actually Matter
Built-in LED flashlights are genuinely useful for nighttime emergencies, and power bank functionality lets you charge your phone if you’re stranded. USB ports are standard on most Noco models, but check whether they use USB-A or the newer USB-C standard. Some models also include a flashlight with emergency strobe modes. These extras don’t affect charge retention, but they make the unit more versatile when you’re in a bind.
My Shortcut Advice: Focus on peak amps matching your engine, then buy the smallest Noco Boost that covers that power level. The GB40 hits the sweet spot for most drivers and has proven long-term charge retention in thousands of real-world reviews.
Frequently Asked Questions
What is the best Noco Boost for a full-size pickup truck?
If you drive a full-size truck with a V8 gas engine or any diesel, I recommend the NOCO Boost X GBX45 with 1250 peak amps. It’s rated for 6.5L gas engines and 4.0L diesel engines, which covers most heavy-duty pickups. The upgraded clamps also feel much more substantial than the standard models, making connections easier in tight engine bays.
How long will a Noco Boost hold a charge in storage?
In my experience and based on thousands of user reports, a Noco Boost can hold a usable charge for 12 to 18 months when stored properly. The lithium cells have a very low self-discharge rate, so you can stash one in your trunk at the start of winter and it’ll still fire up your engine come spring. I always recommend topping it off every 6 to 12 months just to be safe.
Can a Noco Boost jump-start a diesel engine?
It depends on the model. The NOCO Boost GB40 handles up to 3.0L diesel engines, and the Boost X GBX45 handles up to 4.0L diesel engines. The smaller GB20 is gas-only and won’t work on diesels. If you own a diesel vehicle, stick with the GB40 or GBX45 to make sure you have enough cranking power for those high-compression engines.
What’s the difference between the NOCO Boost GB40 and the GBX45?
The main difference is power and engine capacity. The GB40 delivers 1000 peak amps for 6.0L gas and 3.0L diesel engines, while the GBX45 delivers 1250 peak amps for 6.5L gas and 4.0L diesel engines. The GBX45 also has heavier-duty clamps and a more rugged build, but it’s noticeably larger and heavier. For most daily drivers, the GB40 is plenty—the GBX45 is overkill unless you need the extra diesel capacity.
Is the NOCO Boost GB20 powerful enough for a small car?
Absolutely. The GB20’s 500 peak amps are perfect for 4.0L gas engines and smaller, which covers most sedans, coupes, and compact crossovers. I’ve used it on a Honda Civic and a Toyota Corolla without any issues. It’s also the most compact option, so it fits easily in a glovebox. Just don’t try it on a V6 or any diesel engine—it won’t have enough juice.
Can I use a Noco Boost as a power bank for my phone?
Yes, all three models I tested double as power banks with USB output ports. The GB40 and GBX45 can charge a phone multiple times, while the smaller GB20 has enough capacity for a couple of full charges. It’s a nice bonus feature, but don’t expect to power a laptop or run appliances—these are jump starters first and foremost, not full power stations.
How do I know if a Noco Boost is holding its charge properly?
The easiest way is to check the built-in battery indicator lights every few months. Most Noco models have a button that shows the current charge level. If the indicator shows less than 50% after a few months of storage, that’s normal—just recharge it. If it’s dead flat after 3 months, you might have a defective unit. I’ve never had that issue with any of the three I tested.
What’s the most common mistake people make with Noco Boost jump starters?
The biggest mistake I see is buying the wrong power level for their vehicle. People either buy a tiny GB20 for a V8 truck and wonder why it won’t start, or they buy a massive GBX45 for a tiny commuter car and waste money on power they don’t need. Match the peak amps to your engine size, and you’ll get reliable starts every time.
My Final Verdict
After testing all three models side by side, the NOCO Boost GB40 is my clear winner for anyone who wants a jump starter that actually holds a charge for years. Its 1000 peak amps cover the vast majority of vehicles, the charge retention is proven across over 127,000 ratings, and it’s compact enough to stash anywhere. The GBX45 is my pick for diesel owners who need the extra 1250 amps, while the GB20 is a fantastic budget option for small car drivers who don’t want to overspend.
If you’re still on the fence, here’s my simple advice: match the peak amps to your engine size, then buy the smallest Noco Boost that covers it. For most people, that’s the GB40. It’s the sweet spot of power, price, and long-term reliability.
Winner: NOCO Boost GB40
- START DEAD BATTERIES — Instantly start dead batteries with 1000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
The best Noco Boost Ultrasafe jumpstarter that actually holds a charge for years. Buy this if you drive a typical car, SUV, or light truck and want proven long-term reliability from the #1 Best Seller in Jump Starters.
Runner-Up: NOCO Boost GB20
- START DEAD BATTERIES — Instantly start dead batteries with 500 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
The budget-friendly choice for small car owners. Its 500 peak amps handle 4.0L gas engines perfectly, and it’s small enough to live in your glovebox year-round without taking up space.
Upgrade Pick: NOCO Boost X GBX45
- X FOR EXTREME — A new class of lithium jump starters. Rated at 1,250 amps...
- ULTRASAFE 2.0 — Upgraded spark-proof and reverse polarity protection with...
The heavy-duty option for truck and diesel owners. With 1250 peak amps for 6.5L gas and 4.0L diesel engines, it’s the most powerful Noco Boost that still holds a charge reliably for years.