Portable Jump Starters by Engine Size: 2000A to 6000A Picks
For most cars and SUVs, choose the Hulkman Alpha85, because Hulkman rates it for gas engines up to 8.5L and diesels up to 6.0L and it doubles as a USB-C power bank. If you drive a diesel up to 10L, the cheaper GOOLOO GP4000 covers it, and the AVAPOW A68 is for diesels up to 12L. Recharge any of them every few months.
The Verdict
Our Verdict
Match the pack to the engine size its maker rates it for, insist on protected clamps, and keep it charged. The Hulkman Alpha85 is our top pick for cars and SUVs; the GOOLOO GP4000 adds diesel headroom for less money, and the AVAPOW A68 is for the largest diesels.
Key takeaways
- Buy by the maker's engine rating. Hulkman rates the Alpha85 to 8.5L gas and 6.0L diesel; GOOLOO's GP4000 to 10L diesel; AVAPOW's A68 to 12L diesel.
- Protected clamps are essential. Reverse-polarity and spark protection reduce the cost of a hurried roadside mistake.
- A charged pack beats a big one. Hulkman asks owners to recharge at least every three months and keep it above 80 percent.
Hulkman Alpha85 — 2000A, 74Wh, 3.3in display
- Hulkman rates it for gas engines up to 8.5L and diesels up to 6.0L
- 3.3-inch smart screen shows charge level, status and fault warnings instead of LED bars
- 65W USB-C Power Delivery in and out, so it recharges fast and runs a laptop
Our top pick for most cars and SUVs: Hulkman rates the Alpha85's 2000A for gas engines up to 8.5L and diesels up to 6.0L, its 3.3-inch screen shows charge and error states, and its 65W USB-C port recharges the pack and runs a laptop.
Side-by-side comparison
#1Hulkman Alpha85 — 2000A, 74Wh, 3.3in display 4.7 | #2GOOLOO GP4000 — 4000A, dual USB output 4.6 | #3AVAPOW A68 — 6000A, USB3.0 power bank 4.4 | |
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| DriveScored | |||
| Verdict | The all-rounder for people who want the pack to double as a laptop or phone bank: Hulkman rates the Alpha85's 2000A for gas engines up to 8.5L and diesels up to 6.0L, and its 65W USB-C PD charges in and out. The 3.3-inch screen reports exact charge and fault state rather than making you guess at LED bars. | The high-amp budget option: 4000A peak rated for all gas engines and diesels up to 10.0L, with SuperSafe clamp protection and a big enough cell to work as a dual-USB power bank. Note this is the GP model — GOOLOO's pricier GT4000S is the one with 100W two-way USB-C, which this does not have. | The headroom option for big trucks and diesels: AVAPOW rates the A68 at 6000A peak and up to a 12L diesel, with an eight-layer clamp protection system and indicator lights that make a wrong connection hard to complete. It also works as a dual-USB power bank with a 3-mode LED light. Overkill for a commuter car, right-sized if you regularly start large diesel powerplants. |
| Price | ~$119.99Buy on Amazon | ~$79.99Buy on Amazon | ~$142.46Buy on Amazon |
| Peak Amps | 2000A | 4000A | 6000A |
| Engine Support | Up to 8.5L gas / 6.0L diesel (Hulkman) | All gas / up to 10.0L diesel | All gas / up to 12L diesel |
| Capacity | 74Wh (~20,000mAh) | - | - |
| USB Output | USB-C PD 65W (in/out) | Dual USB output | Dual USB incl. USB3.0 |
| Display | 3.3in smart screen | - | - |
| Buyer sentiment | Reliability Quality Ease Of Use Value for money Buyers praise reliability, quality, ease of use and value for money. Mixed feedback on battery life. Based on 3,417 user mentions | Functionality Quality Ease Of Use Value for money Durability Buyers praise functionality, quality, ease of use and value for money. Mixed feedback on battery life. Some flag durability. Based on 3,265 user mentions | - |
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* Prices are approximate. Click Buy to see current pricing on Amazon.
The high-amp budget option: 4000A peak rated for all gas engines and diesels up to 10.0L, with SuperSafe clamp protection and a big enough cell to work as a dual-USB power bank. Note this is the GP model — GOOLOO's pricier GT4000S is the one with 100W two-way USB-C, which this does not have.
The headroom option for big trucks and diesels: AVAPOW rates the A68 at 6000A peak and up to a 12L diesel, with an eight-layer clamp protection system and indicator lights that make a wrong connection hard to complete. It also works as a dual-USB power bank with a 3-mode LED light. Overkill for a commuter car, right-sized if you regularly start large diesel powerplants.
Buy on AmazonWhich portable jump starter fits you
| If your situation is… | Pick | Why |
|---|---|---|
| Gas car or SUV, and you want a power bank too | Hulkman Alpha85 | Rated by Hulkman to 8.5L gas, with a charge-reporting screen and 65W USB-C. |
| Diesel pickup up to 10L on a budget | GOOLOO GP4000 | GOOLOO rates it for diesels up to 10L, for $79.99. |
| Large diesel truck up to 12L | AVAPOW A68 | AVAPOW rates it at 6000A and up to a 12L diesel. |
| The pack lives in the car through winter | Hulkman Alpha85 | Its screen shows exact charge, which makes the three-month recharge check quick. |
Each pick is one of the products ranked below - this row is for shortcutting based on your situation, not a separate recommendation.
A portable jump starter is insurance against a weak battery, but the box sells one dramatic number, peak amps, that is not measured the same way across brands. A better decision starts with the engine the maker says the pack can start, then clamp protection, then whether the pack will still be charged on the cold morning you need it.
Match the pack to your engine, not the peak-amp number
The most useful figure on a jump starter is the engine size its maker rates it for. Here is what each maker states for the three packs we rank:
| Pack | Peak amps (maker) | Gas engines (maker) | Diesel engines (maker) |
|---|---|---|---|
| Hulkman Alpha85 | 2000A | Up to 8.5L | Up to 6.0L |
| GOOLOO GP4000 | 4000A | All gas engines | Up to 10L |
| AVAPOW A68 | 6000A | All gas engines | Up to 12L |
Read the table by the diesel column if you drive a diesel, because that is where the packs really separate. For a gas car or SUV, the Alpha85's 8.5L rating already covers most engines on the road, so the bigger packs mainly buy diesel headroom. If you are not sure which row your car falls in, the jump starter sizing tool works it out from your engine, and how many amps you actually need explains why the peak figure is the wrong place to start.
Rule of thumb: buy above your engine's rating, not exactly at it. Cold weather and a deeply flat battery both make the job harder.
The three packs, by job
Hulkman Alpha85: the all-rounder for cars and SUVs
Hulkman rates the Alpha85's 2000A for gas engines up to 8.5L and diesels up to 6.0L, and builds in a 3.3-inch screen that shows charge level and error states. Its 65W USB-C port charges the pack and can run a laptop, which makes it the most useful of the three on days nothing is wrong. It is our top pick for most drivers at $119.99.
GOOLOO GP4000: diesel headroom on a budget
GOOLOO rates the GP4000 for all gas engines and diesel trucks up to 10L, with reverse-polarity protection on the clamps. It costs less than the Alpha85 at $79.99, and the trade is the outputs: dual USB rather than USB-C power delivery, so it recharges more slowly and is a weaker power bank.
AVAPOW A68: the largest diesels
AVAPOW rates the A68 at 6000A and up to a 12L diesel. That is more than a commuter car will ever draw, so it only makes sense if you regularly start large diesel engines. It costs $142.46.
Clamp protection is not optional
Jump-starting usually happens in a hurry, in poor light, often in the cold. Reverse-polarity warnings, spark protection and a clear connection sequence are what stop a rushed mistake from becoming a damaged battery or a burned clamp. Every pack here lists clamp protection, and the AVAPOW adds indicator lights that make a wrong connection hard to complete. Read your pack's connection order at home, before the emergency, and keep the step-by-step jump-start guide handy.
Winter: keep the pack charged and out of the extremes
A jump starter is only as good as its charge on the day you need it, and winter is when most packs get used. Hulkman's own storage advice for its Alpha packs is specific:
- Recharge at least every three months, even if you have not used it
- Keep it above 80 percent, because a completely dead car battery asks more of the pack
- Avoid charging or leaving it in extremely hot or cold places, including direct sun
Hulkman's product page says a full charge holds for up to 18 months. Follow the support article's three-month routine instead: the longer figure is a best case, not a maintenance plan. In practice that means bringing the pack indoors to charge rather than charging it in a freezing car, and putting a recharge reminder on the same calendar as your oil changes. If your car will not start on a cold morning, why cars don't start in the cold explains what is going on before you reach for the clamps.
Winter check: a charged mid-size pack beats a flat giant one. The recharge habit matters more than the amp rating.
How the scores compare
The table below lists each pack's DriveScore, our 0–100 summary of published specs and owner ratings. Our pick order is editorial: the Alpha85 leads because its engine rating, screen and USB-C output suit most drivers, not because it has the most amps.
Bottom line
The Hulkman Alpha85 is our top pick for cars and SUVs. Choose the GOOLOO GP4000 if you want diesel headroom up to 10L for less money, and the AVAPOW A68 only if you start diesels up to 12L. Whichever you buy, recharge it every few months.
Your next step
Match the pack to the engine, then review the safe connection sequence.
Common questions
How many amps does my jump starter need?
Can I leave a lithium jump starter in the car?
What safety features should I require?
Research Sources
- NOCO Boost GB40 User Guide (rev. 03.07.2025) — clamp connection sequence, storage temperature range, and the instruction that an unused pack discharges and must be recharged before use
- HULKMAN — Alpha 85 product page (2000A, up to 8.5L gas and 6.0L diesel, 65W USB-C, 3.3-inch display)
- HULKMAN Support — Recommendations on how to store your Alpha jump starter (recharge every 3 months, keep above 80%, avoid temperature extremes)
- GOOLOO — GP4000 4000A jump starter product page (all gas engines and diesels up to 10L)
