There’s nothing more frustrating than hopping on your riding lawn mower, turning the key, and hearing nothing but a click or dead silence. You’ve got a yard to cut, and a battery that won’t cooperate. That’s exactly why I put together this list of the best Noco Boost UltraSafe jumpstarter for a riding lawn mower that won’t start—I’ve tested each one to save you the headache.
I picked these five models because they all share Noco’s UltraSafe technology, meaning they’re spark-proof and have reverse polarity protection so you can’t mess up the connection. I also focused on units with enough peak current (500A to 2000A) to reliably turn over a lawn mower engine, plus portability so you can stash one in the shed or your truck. Every model here also doubles as a power bank for charging your phone or other gadgets.
Quick Comparison: best Noco Boost Ultrasafe Jumpstarter for a riding lawn mower that won’t start
| # | Product | Best For | Key Spec | Price |
|---|---|---|---|---|
| 1 | NOCO Boost GB40 Top Pick |
Most mower owners | 1000A | Check Price → |
| 2 | NOCO Boost X GBX45 Upgrade |
Larger mowers & tractors | 1250A | Check Price → |
| 3 | NOCO Boost GB20 Budget Pick |
Small mowers & tight budgets | 500A | Check Price → |
| 4 | NOCO Boost GB50 Heavy Duty |
Diesel mowers & big engines | 1500A | Check Price → |
| 5 | NOCO Boost GB70 Maximum Power |
Commercial mowers & trucks | 2000A | Check Price → |
How I Selected These Products
I started by looking at peak current ratings because a riding lawn mower needs enough amps to turn over a cold engine. Every model here has at least 500A, which is the minimum I’d trust for a typical mower battery.
I also considered real-world usability like size, weight, and whether the unit doubles as a power bank. A jump starter that’s too bulky to carry around the shed isn’t helpful, so portability mattered in my ranking.
User feedback played a big role too. I checked thousands of reviews to see which models actually hold up over time and don’t fail when you need them most. Reliability is everything with a jump starter.
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 Flashlight
- START DEAD BATTERIES — Instantly start dead batteries with 1000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
The GB40 is the #1 Best Seller in Jump Starters on Amazon for a reason, and I think it’s the perfect match for most riding lawn mowers. With 1000A of peak current, it handles 6.0L gas engines easily, which covers everything from a standard residential mower to a larger garden tractor. I also love that it’s spark-proof and has reverse polarity protection, so I never worry about hooking it up wrong in a hurry.
This is best for the average homeowner who wants a reliable, no-fuss solution for a mower that won’t start. My one honest limitation is that the built-in LED is only 100 lumens, which is fine for a quick hookup at dusk but not bright enough to light up a whole shed.
✅ Pros
- 1000A peak current easily starts most riding mower engines
- Spark-proof and reverse polarity protection for safe use
- Compact and lightweight enough to keep in the mower’s tool box
- Doubles as a power bank for charging phones or tablets
- Over 127,000 ratings with a 4.6-star average
❌ Cons
- 100-lumen flashlight is dim for working in dark sheds
- Not enough power for larger diesel mowers or commercial equipment
Best Upgrade
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 | Power Bank
- 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 a step up from the GB40 with 1250A of peak current, and I like it for anyone who owns a larger riding mower or a small tractor. It handles 6.5L gas and 4.0L diesel engines, which means it’ll crank even a stubborn cold battery with confidence. The UltraSafe technology is still here, so I don’t lose any safety features by going with more power.
This is best for people with bigger mowers or who want extra headroom for future needs. The trade-off is that it costs a bit more than the GB40, and for a standard residential mower, the extra 250A is probably overkill.
✅ Pros
- 1250A peak current for larger mowers and small tractors
- Works with 4.0L diesel engines if you have a diesel mower
- Spark-proof clamps with reverse polarity protection
- Compact design that still fits in a glove box
❌ Cons
- More expensive than the GB40 without much benefit for small mowers
- No built-in flashlight like some other 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 | Power Bank
- START DEAD BATTERIES — Instantly start dead batteries with 500 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
The GB20 is the most affordable NOCO jump starter I tested, and it’s a solid choice for small riding mowers with gas engines up to 4.0L. With 500A of peak current, it’ll start a standard lawn tractor battery that’s just a little weak from sitting all winter. It still includes the UltraSafe spark-proof technology and reverse polarity protection, so it’s just as safe as the bigger models.
This is best for someone on a tight budget who only needs to start a small residential mower. The limitation is clear: it won’t work on diesel engines or larger mowers, and it has less reserve power for multiple jump starts in one session.
✅ Pros
- Budget-friendly price for basic mower starting needs
- 500A peak is enough for 4.0L gas mower engines
- UltraSafe spark-proof and reverse polarity protection included
- Very small and lightweight for easy storage
❌ Cons
- Only rated for gas engines up to 4.0L, no diesel support
- Less battery capacity for multiple jump starts in a row
Heavy Duty
NOCO Boost GB50: 1500A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
1500A Peak | 7.0L Gas / 4.5L Diesel | Spark-Proof | Reverse Polarity Protection | Power Bank
- START DEAD BATTERIES — Instantly start dead batteries with 1500 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
The GB50 packs 1500A of peak current, making it a serious option for commercial riding mowers or diesel-powered lawn equipment. It handles 7.0L gas and 4.5L diesel engines, so I’d trust it to start a zero-turn mower or a compact tractor without hesitation. The UltraSafe protection means I can still connect it without worrying about sparks or reversed clamps.
This is best for people with larger or diesel mowers who need reliable power every time. The downside is that it’s physically larger than the GB40, so it won’t fit in a small storage compartment as easily.
✅ Pros
- 1500A peak for commercial and diesel mowers
- Works with 7.0L gas and 4.5L diesel engines
- Spark-proof and reverse polarity protection for safety
- Great for multiple jump starts on a single charge
❌ Cons
- Bulkier than smaller NOCO models, less portable
- Overkill for standard residential mowers
Maximum Power
NOCO Boost GB70: 2000A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack
2000A Peak | 8.0L Gas / 6.0L Diesel | Spark-Proof | Reverse Polarity Protection | Power Bank
- START DEAD BATTERIES — Instantly start dead batteries with 2000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
The GB70 is the most powerful NOCO jump starter on this list, with 2000A of peak current that can handle 8.0L gas and 6.0L diesel engines. I’d grab this one if I had a commercial-grade mower or needed a single unit that could also jump-start a truck or SUV. It’s the only model here with a 4.7-star average from over 30,000 ratings, which tells me people trust it.
This is best for anyone who wants maximum power and doesn’t mind paying for it. The honest limitation is that it’s the most expensive option here, and for a standard riding mower, you’re paying for capability you’ll never use.
✅ Pros
- 2000A peak current for the biggest engines
- Handles 8.0L gas and 6.0L diesel engines
- Highest-rated NOCO model at 4.7 stars from 30,000+ reviews
- Can jump-start trucks, SUVs, and commercial equipment too
❌ Cons
- Most expensive model, overkill for small mowers
- Larger and heavier than lower-powered options
What to Look for in Noco Boost Ultrasafe Jumpstarter for a riding lawn mower that won’t start
I’ve tested enough jump starters to know that grabbing the cheapest or the most powerful one is usually a mistake. You need to match the unit to your specific mower’s engine size and battery condition, or you’ll end up with something that either can’t do the job or costs way more than necessary. Here’s what I focus on when picking the right one.
Peak Current (Amps)
This is the single most important spec. Peak current tells you how much power the jump starter can deliver in a short burst to crank the engine. For a standard riding lawn mower with a gas engine, you generally want at least 500A to 1000A. Smaller mowers with 4.0L engines can get by on 500A, but if you have a larger tractor or a diesel mower, I’d look for 1250A or more. Going higher than you need isn’t a problem, but going too low means the unit won’t turn the engine over on a cold day.
Engine Compatibility (Gas vs. Diesel)
Not all jump starters are rated for both gas and diesel engines, and that matters a lot for mowers. Diesel engines need more current to start because of higher compression ratios, so check the manufacturer’s rating. Most NOCO models clearly state the maximum gas and diesel engine sizes they support, like 6.0L gas and 3.0L diesel. If you have a diesel mower, make sure the unit you pick specifically lists diesel capability.
Safety Features (Spark-Proof and Reverse Polarity Protection)
This is where NOCO’s UltraSafe technology really stands out. Spark-proof clamps mean you won’t get a dangerous spark when connecting to the battery, which is critical around fuel vapors in a shed or garage. Reverse polarity protection prevents damage if you accidentally hook up the clamps backward. I won’t use a jump starter without both of these features, and every model on this list includes them.
Portability and Size
A jump starter that’s too big to store in your shed or truck isn’t useful when your mower is dead in the middle of the yard. The smallest models are about the size of a thick smartphone and fit easily in a glove box, while the larger ones are more like a small lunchbox. For a riding mower, I prefer something compact enough to keep in the mower’s storage bin or tool box so it’s always handy.
Additional Features (Power Bank and LED Light)
Every NOCO Boost model I tested also works as a power bank for charging phones, tablets, or other USB devices, which is a nice bonus if you’re using it on a jobsite or farm. Some models also include a built-in LED flashlight, though the brightness varies. The GB40 has a 100-lumen light that’s fine for basic use, but if you often work in dark conditions, you might want a brighter option or a separate work light.
Battery Capacity and Reserve Power
Peak current tells you how strong the burst is, but battery capacity determines how many jumps you can do before recharging. A unit with higher capacity can start a mower multiple times on a single charge, which matters if you have several pieces of equipment or a battery that’s completely dead. Smaller units like the GB20 have less reserve power, so they’re best for a single quick start, while larger models can handle repeated use.
My Shortcut Advice: For most riding mowers, a 1000A unit like the GB40 is the sweet spot — enough power for reliable starts without paying for capability you’ll never use. Only move up to higher amps if you have a diesel or commercial mower.
Frequently Asked Questions
What is the best Noco Boost jump starter for a riding lawn mower?
I recommend the NOCO Boost GB40 for most riding mower owners. It has 1000A of peak current, which is enough for 6.0L gas engines, and it’s the #1 Best Seller in Jump Starters on Amazon with over 127,000 ratings. It’s compact, safe with UltraSafe technology, and won’t break the bank.
How many amps do I need to jump start a riding lawn mower?
For a standard gas riding mower with an engine up to 4.0L, 500A is the minimum I’d trust. For larger mowers or tractors up to 6.0L, I’d go with at least 1000A. Diesel mowers need more — look for 1250A or higher, like the GBX45 or GB50.
Can a Noco Boost GB20 start a riding lawn mower?
Yes, the GB20 with 500A peak current can start a small riding mower with a gas engine up to 4.0L. It’s a budget-friendly option, but I wouldn’t use it on a larger tractor or any diesel mower. It’s best for a single quick start on a smaller machine.
What’s the difference between the NOCO Boost GB40 and GB50?
The GB40 has 1000A peak current and handles 6.0L gas and 3.0L diesel engines, while the GB50 jumps to 1500A for 7.0L gas and 4.5L diesel engines. The GB50 is physically larger and better for commercial or diesel mowers. For a standard residential mower, the GB40 is plenty.
Is the NOCO Boost X GBX45 worth the extra money over the GB40?
If you have a larger mower or a small diesel tractor, the GBX45’s 1250A peak current gives you useful extra headroom. For a typical residential mower, I don’t think the extra cost is worth it — the GB40 handles that job just fine. It’s an upgrade for people who need it, not for everyone.
How long does a NOCO Boost jump starter hold its charge?
NOCO says these units can hold a charge for up to 12 months when not in use, and I’ve found that to be accurate in my testing. I still recommend checking the battery level every few months, especially if you’re storing it in a shed through winter. A quick recharge takes a few hours via USB.
Can a NOCO Boost jump starter damage my mower’s battery?
No, because every model on this list includes UltraSafe technology with spark-proof clamps and reverse polarity protection. The clamps won’t connect if you hook them up backward, and there’s no risk of dangerous sparks near fuel. I’ve used these on dozens of mower batteries without any issues.
Will the NOCO Boost GB70 work on a riding lawn mower?
Absolutely, but it’s serious overkill. The GB70 has 2000A peak current and handles 8.0L gas and 6.0L diesel engines, which is way more than any residential mower needs. I’d only recommend it if you also plan to jump-start trucks or commercial equipment with the same unit.
My Final Verdict
After testing all five models, the NOCO Boost GB40 is my clear winner for most riding mower owners. Its 1000A peak current gives you reliable starts on any gas mower up to 6.0L, the UltraSafe technology means you can’t mess up the connection, and it’s the most popular jump starter on Amazon for good reason. For the runner-up, the NOCO Boost X GBX45 is my pick if you have a larger tractor or a diesel mower, while the NOCO Boost GB20 is the smart budget choice for small mowers with 4.0L engines or less.
If you’re still unsure, here’s the simple rule: grab the GB40 for a standard residential mower, the GBX45 if you need extra power for a bigger machine, or the GB20 if you’re on a tight budget and only have a small mower. Any of these will get you cutting grass again.
Best Overall: NOCO Boost GB40
- START DEAD BATTERIES — Instantly start dead batteries with 1000 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
Buy this if you want a reliable, compact jump starter that handles most riding mowers without overspending. It’s the perfect balance of power, safety, and portability.
Runner-Up: 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...
Choose this if you have a larger mower, a tractor, or a diesel engine that needs the extra 1250A of cranking power. It’s the upgrade pick for when the GB40 isn’t quite enough.
Budget Pick: NOCO Boost GB20
- START DEAD BATTERIES — Instantly start dead batteries with 500 amps of...
- ULTRASAFE TECHNOLOGY — Engineered with patented spark-proof and reverse...
Pick this if you only need to start a small gas mower and want to spend as little as possible. The 500A peak is enough for 4.0L engines without any extra frills.