Jump Starters
The best jump starters under $100
This bracket covers most cars honestly. It stops dead at diesels — and it is full of peak-amp claims that are not comparable.
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How we assessed these: picks are selected from manufacturer specifications, current retailer listings and published owner feedback — not from hands-on testing of every unit. We publish no prices, so the bracket in the title describes the market tier rather than a figure we have verified today.
Short answer
Under $100 comfortably buys a pack with a published 6.0-liter gas engine rating, which covers most cars and crossovers. It does not reliably buy a diesel-capable pack — diesel ratings run about half the gas figure, and the packs that clear a modern diesel pickup sit above this bracket.
Jump starters are the opposite of tire inflators at the budget end. With an inflator, cheap is mostly fine. With a jump pack, the bracket you are in determines whether the published rating means anything — and this is the one product on the site where the thing you are buying is a promise about the worst morning of the year.
Quick picks
Tap any row to jump to the full write-up. Scoring criteria are published in full on our methodology page.
| # | Product | Best for | Our read | Price |
|---|---|---|---|---|
| 1 | NOCO Boost Plus GB40 Best overall in the bracket | Most cars and small SUVs | 6.0 L gas rating, published and warranted | Check price on Amazon #ad Affiliate link · We show no price here; Amazon shows the current one |
| 2 |  NOCO Boost Sport GB20 Best for small engines | Motorcycles, ATVs and small engines | 4.0 L gas — bikes, quads, small cars | Check price on Amazon #ad Affiliate link · We show no price here; Amazon shows the current one |
| 3 |  GOOLOO GT4000S Biggest claimed numbers | Maximum claimed amps per dollar | Read the rating language before you rely on it | Check price on Amazon #ad Affiliate link · We show no price here; Amazon shows the current one |
| 4 |  STANLEY FATMAX J7CS Best one-box option | A cheap one-box jump-and-inflate station | Adds a compressor, at V6 and lead-acid | Check price on Amazon #ad Affiliate link · We show no price here; Amazon shows the current one |
What this bracket genuinely covers
Sized on published manufacturer ratings rather than headline amps:
| Your engine | Covered in this bracket? |
|---|---|
| Four-cylinder car or crossover | Yes, comfortably |
| V6 up to 6.0 L gas | Yes — this is the bracket's sweet spot |
| Motorcycle, ATV, mower | Yes, and a smaller pack is the correct choice |
| Gas V8 above 6.0 L | Marginal — you want the next class up |
| Any modern diesel pickup | No. See the diesel roundup |
| 24 V commercial or semi | No. See the semi truck guide |
Diesel ratings run roughly half the gas rating for the same pack, which is why the diesel row falls outside the bracket rather than being a close call.
The claim to distrust in this tier
Peak amps. There is no standardized industry test behind the figure the way there is for a car battery's cold cranking amps, so brands define the measurement differently. That matters most exactly here, because the budget tier competes on the headline number.
The practical consequence: a 4,000-amp claim from an unfamiliar brand and a 1,000-amp rating from a major one are not telling you the same kind of thing. What you can compare is a published engine rating in liters, because that is a commitment the manufacturer warrants. Peak amps vs cranking amps explains the distinction in full.
Related: treat mAh figures as uninformative. Without a stated voltage they are not a capacity, and on a pack you might want to fly with they obscure the watt-hour number airline rules are written around — the conversion is here.
What you give up against the tier above
- Diesel capability, almost entirely. This is the clean line.
- Reserve capacity. Fewer watt-hours means fewer attempts, which bites hardest in cold weather when each attempt costs more.
- Charging convenience. USB-C Power Delivery in and out tends to sit above this bracket; here you are more likely to get a slower USB-A input.
- Warranty and support, which is where unfamiliar brands most often disappoint.
The picks
1. Best overall in the bracket
NOCO Boost Plus GB40
NOCO · Best for most cars and small suvs
The default answer for a four- or six-cylinder car: 1,000 peak amps, 24 watt-hours, and light enough that it actually stays in the trunk.
Published specifications
What works
- 24 Wh sits far under the 100 Wh carry-on threshold, so flying with it needs no airline approval
- 2.45 lb and pocketable — the size that decides whether a tool is still in the trunk six months later
- IP65 enclosure, so a wet shoulder in the rain is not a problem
- Reverse-polarity protection means a backwards clamp does not spark
What does not
- 1,000 peak amps runs out of headroom above a 6.0 L gas engine
- The 3.0 L diesel ceiling rules out most modern diesel pickups
- 24 Wh is a small reserve — it is a jump starter, not a power bank substitute
Skip it if
Not the one to buy if you drive a diesel pickup or a big V8. You would be at the edge of its rating on a cold morning, which is exactly when you want margin.
#ad Affiliate link · We show no price here; Amazon shows the current one
Raw specifications: NOCO’s own page for the NOCO Boost Plus GB40.
2. Best for small engines
NOCO Boost Sport GB20
NOCO · Best for motorcycles, atvs and small engines
The smallest pack in the range and the right one for powersports: 500 peak amps, 2.1 lb, and a gas rating that stops at 4.0 liters — which is all a bike or a quad ever asks for.
Published specifications
What works
- 2.1 lb — light enough to live under a motorcycle seat or in an ATV storage box, which is the whole point
- 500 peak amps is correctly sized for powersports batteries rather than wildly over them
- Same IP65 enclosure and reverse-polarity protection as the larger packs
- 24 Wh, so it flies in carry-on baggage like the rest of the range
What does not
- The 4.0 L gas ceiling rules out most cars, so it is not a do-everything pack
- NOCO states diesel is not recommended at all for this model — read that as a hard limit
- Small reserve, so cold-weather attempts eat into it quickly
Skip it if
Do not buy it as your car's pack as well. NOCO's own rating stops at 4.0 L gas and says not recommended for diesel, and a bike pack asked to start a car is exactly the wrong economy.
#ad Affiliate link · We show no price here; Amazon shows the current one
Raw specifications: NOCO’s own page for the NOCO Boost Sport GB20.
3. Biggest claimed numbers
GOOLOO GT4000S
GOOLOO · Best for maximum claimed amps per dollar
A high-claimed-amp budget pack. Worth a look on price, but read the rating language closely — peak-amp claims in this tier are not stated the way the majors state them.
This manufacturer does not publish a full specification table for this model on its own site. Rather than repeat figures we cannot source, the assessment below is limited to what the product category and the retailer listing genuinely establish.
What works
- One of the cheapest routes to a large-engine rating
- Usually ships with a case, cables and a wall adapter in the box
What does not
- Budget-tier peak-amp claims are not directly comparable to a major brand's published rating
- Support and warranty handling is the usual weak point against NOCO or DEWALT
- Capacity is often quoted in mAh rather than watt-hours, which obscures airline legality
Skip it if
Not the pick if the pack is your only plan for a remote breakdown. For that, pay for a published rating and a warranty you can actually use.
#ad Affiliate link · We show no price here; Amazon shows the current one
4. Best one-box option
STANLEY FATMAX J7CS
STANLEY · Best for a cheap one-box jump-and-inflate station
A lead-acid station with a 120 PSI compressor and triple USB, rated to V6 — the budget end of the one-box category, and honest about being it.
Published specifications
- Jump starting
- 700 peak amps / 350 instant starting amps, rated to V6 source
- Air compressor
- 120 PSI, backlit gauge source
- USB output
- Triple USB ports source
- Battery types
- 12 V AGM, gel and wet lead-acid source
- AC
- Built-in 120 V AC charger (charging input — not an AC power outlet) source
- Light
- LED, rotates 270 degrees source
What works
- Jump starting, a 120 PSI compressor and USB charging in one case at the cheapest point in the category
- Built-in AC charger, so there is no separate brick to lose
- Reverse-polarity alarm, and metal clamps rather than the plastic ones at this price
- Lead-acid, so a hot trunk does not permanently cost it capacity
What does not
- 700 peak / 350 instant amps and a V6 rating — this is not a truck or diesel tool
- Lead-acid self-discharges, so it needs topping up on a schedule or it is flat when you need it
- Heavier and bulkier than a lithium pack of equivalent starting ability
Skip it if
Not enough pack for a V8, a diesel or anything you rely on in the cold. STANLEY rates it to V6, and buying at the edge of a rating is how people end up stranded twice.
#ad Affiliate link · We show no price here; Amazon shows the current one
Raw specifications: STANLEY’s own page for the STANLEY FATMAX J7CS.
The cheaper thing that prevents more breakdowns
If your car has already been slow to crank, a battery maintainer costs less than any pack on this page and prevents more roadside stops than a pack resolves. A pack rescues you; a maintainer stops the battery getting there. Ideally you own both, and if the budget only stretches to one and the symptom is already showing, buy the charger.
Key takeaways
- Sub-$100 reliably buys a 6.0 L gas rating — most cars and crossovers.
- It does not buy diesel capability; that line is clean, not marginal.
- Peak-amp claims are not comparable across brands — buy on the engine rating.
- mAh without a voltage is not a capacity.
- If the car already cranks slowly, a maintainer beats a bigger pack.
How we sourced this
Every figure on this page came from one of the following. Where a manufacturer or regulator does not publish a number, we say so rather than estimate it.
Common questions
- Is a jump starter under $100 any good?
- Yes, for most cars. This bracket comfortably reaches a published 6.0-liter gas engine rating, which covers four-cylinder and V6 cars and crossovers with margin. Where it stops is diesel: diesel ratings run about half the gas figure, so diesel-capable packs sit above the bracket.
- Why do cheap jump starters claim such high peak amps?
- Because peak amps has no standardized industry test behind it the way a car battery's cold cranking amps does, so brands define the measurement differently. A large number from an unfamiliar brand is not comparable to a major brand's published rating. Compare the engine rating in liters instead.
- Will a budget jump starter start a diesel?
- Generally no. A diesel ignites by compression and draws glow-plug current before the starter engages, so manufacturers rate the same pack to roughly half the displacement for diesel. Packs that genuinely clear a modern diesel pickup sit above this price bracket.
- Should I buy a jump starter or a battery charger first?
- If the car has already been slow to crank, buy the charger or maintainer — it costs less and prevents the failure rather than rescuing you from it. If your concern is being stranded away from home, buy the pack, because there is no wall outlet on a roadside.
More in Jump Starters
A jump pack is the one trunk tool that turns a tow truck into a five-minute inconvenience. This is how to size one, and which ones are worth the space.
Read next
Best Portable Jump Starters
Best Portable Jump Starters
Our main roundup: five packs from compact to heavy-duty, ranked on the engine rating the manufacturer will actually stand behind.
Guide
Peak vs Cranking Amps
Peak amps is momentary and loosely defined; cranking amps is sustained. Why manufacturers publish engine ratings instead, and what to compare.
Guide
What Size Do I Need?
The sizing table by engine displacement and fuel type, using ratings manufacturers publish and warrant rather than peak-amp marketing.
Best Battery Maintainers
Best Maintainers
Low-current maintainers for seasonal and stored vehicles, including the solar option for anything parked away from an outlet.
Found something out of date, or a figure you can source better than we did? Tell us — corrections get read first. Our methodology explains how picks are made, and contact is one click away.