The best jump starters for a diesel truck

Peak amps are the number on the box and nobody publishes a test method for them. The published diesel displacement ceiling is the number that answers the question, and this category's ceilings get bigger as the price gets lower.

By Sawyer V. · Published November 7, 2026 · How we research

We have not tested any of this. Everything below is compiled from published manufacturer specifications, and the arithmetic is printed so you can check it. This page carries affiliate links: if you buy through one we earn a commission at no extra cost to you, and it does not change the order of the picks. Full disclosure.

The verdict

For a consumer diesel pickup, buy the NOCO Boost GB70 at about $200. NOCO publishes a ceiling of 8.0 L gas and 6.0 L diesel, up to 40 starts per charge, a 5.0 lb weight, an IP65 housing and the patented spark-proof and reverse-polarity interlock - which is the specification that matters most for a tool you use once every three years, in the dark, possibly for the first time. Prices as of November 7, 2026.

If the money matters, the GOOLOO GP4000 at about $80 publishes a 10.0 L diesel ceiling, an operating range of -20 C to 60 C and an 18-month warranty. Whether you believe the ceiling is the entire question, and the section below lays out why the claims across this category stop adding up.

#	Pick	Install	Score	Price
1	NOCO Boost GB70 The published diesel ceiling you can trust	Plugs in	6.8/10	$199.95 - view on Amazon
2	Hulkman Alpha 85S The only published cold-start mechanism	Plugs in	7.4/10	$189.99 - view on Amazon
3	GOOLOO GP4000 A published cold-temperature range	Plugs in	8.2/10	$79.96 - view on Amazon
4	GOOLOO GP3000 A published operating range at sixty dollars	Plugs in	8.6/10	$59.99 - view on Amazon
5	NOCO Boost GB50 The safety design, in a bigger pack	Plugs in	7.4/10	$149.95 - view on Amazon
6	GOOLOO GT6000 The biggest claim on this page	Plugs in	7.6/10	$139.99 - view on Amazon

Click any row to jump to the full write-up further down this page. The “install” column is how the thing attaches to the car, which is the axis that decides whether you actually fit it on a Saturday.

Prices last verified November 7, 2026. They move constantly; the figure on Amazon when you click is the real one.

Why a diesel needs a different pack

A diesel has no spark plugs. It ignites fuel by compressing air hard enough to heat it, which means higher compression to turn over, and on a cold morning it also means glow plugs or a grid heater drawing current before the starter even engages.

The practical consequence is that a diesel start is a longer, heavier draw than a gas start of the same displacement. So the useful question is not how many amps a pack claims for an instant. It is whether it can hold up through several seconds of cranking, more than once, in the cold - and that is a question about stored energy and about cold behavior, not about a peak figure.

The claim ladder, and where it breaks

Line the six up by what they claim and the pattern is not the one you would expect from engineering.

Unit	Peak amps claimed	Published diesel ceiling	Published capacity	Price
NOCO Boost GB70	2,000 A	6.0 L	Not published	$199.95
Hulkman Alpha 85S	2,000 A	6.0 L	74 Wh	$189.99
GOOLOO GP4000	4,000 A	10.0 L	Not published	$79.96
GOOLOO GP3000	3,000 A	7.0 L	16,000 mAh	$59.99
NOCO Boost GB50	1,500 A	4.5 L	Not published	$149.95
GOOLOO GT6000	6,000 A	12.0 L	27,000 mAh	$139.99

Published figures from each maker's listing, read November 7, 2026. Peak amps are published by every brand here; none publishes a test method for the figure.

Read the first and third rows together. Two hundred dollars buys a published 6.0 L diesel ceiling. Eighty dollars buys a published 10.0 L ceiling from a different brand. Either the cheaper pack is four liters better for a hundred and twenty dollars less, or the two brands are measuring different things and calling them the same thing.

What this page ranks on

Published diesel ceiling, read with the brand's whole ladder. A single ceiling figure in isolation says nothing. A ladder that steps conservatively across three products in the same range is a brand describing its own hardware
Published capacity. A diesel cranks for longer, so reserve matters. Hulkman publishes 74 Wh. GOOLOO publishes mAh on two of its three. NOCO publishes nothing at all on either unit here, which is a real gap on the most expensive packs on the page
Published cold behavior. A diesel that will not start is almost always a cold diesel. Hulkman publishes a mechanism and a temperature (pre-heat, stated to -40 F). GOOLOO publishes a range on two units. NOCO publishes neither on either
Published safety interlock. You are clipping a high-current lithium pack onto a battery, in the dark, probably for the first time. NOCO's patented spark-proof and reverse-polarity protection is a named, patented mechanism; GOOLOO's 10 named protections are a count
Warranty term. 24 months from Hulkman, 18 from GOOLOO on two units, 12 from NOCO on both, and nothing published at all on the GT6000

Who each one is for

NOCO Boost GB70 - for a consumer diesel pickup, if you want the conservative claim. A published 6.0 L diesel ceiling, up to 40 starts, IP65, a published weight and recharge time, and the patented interlock. It is the most expensive unit here per claimed amp by a wide margin and NOCO publishes no capacity figure at all. You are buying a ladder that adds up and a company that will answer a warranty claim. Skip it if your truck is a 6.7 L or larger and you want headroom on paper
Hulkman Alpha 85S - for the cold mornings specifically. Same 6.0 L published diesel ceiling as the GB70, ten dollars cheaper, with the two things NOCO does not publish: 74 Wh of capacity and a named cold-start mechanism rated to -40 F. Twenty-four-month warranty. Skip it if what you want is the simplest possible tool - this is the one with a screen and a charging protocol. Best jump starters for cold weather ranks it first and covers the pre-heat mechanism in depth
GOOLOO GP4000 - for the best published figures per dollar. A 10.0 L diesel ceiling, a published operating range of -20 C to 60 C, over 60 starts per charge, 10 named protections and an 18-month warranty, for eighty dollars. If the ceiling is real this is the value pick on the page by a distance. Skip it if you want the claim independently anchored, because nothing here is. Note too that the wall charger is not in the box
GOOLOO GP3000 - for a light-duty diesel and a glovebox. A published 7.0 L diesel ceiling, the same published -20 C to 60 C range, 16,000 mAh of published capacity and 1.39 lb for sixty dollars. The lightest pack here. Skip it for a heavy-duty truck: it is the smallest battery on the page and a long crank is exactly what empties a small battery
NOCO Boost GB50 - for a van or a small diesel, not a truck. The safety design in a 1500 A pack with a published 4.5 L diesel ceiling - the lowest here, and below many consumer diesel pickups. Skip it for a 6.7 L engine: NOCO's own figure says no. Its weight is published twice in the listing and the two figures disagree
GOOLOO GT6000 - no. See the skip note above

Two things to get right before you need it

A jump pack that is flat is a brick, and this is the one tool in the car where that failure is near-universal.

Charge it on a schedule, not when you remember. GOOLOO's own listing says to top it up every two to three months if it has been idle. The GT6000 claims a 24-month standby and most packs claim nothing at all
Know your engine's displacement before you buy. Every ceiling on this page is quoted in liters of displacement, which is printed in your owner's manual and usually on the engine cover. A 3.0 L diesel and a 6.7 L diesel are not the same purchase

If the battery is failing rather than flat, a pack is a symptom treatment: a battery tester tells you which it is, and a proper charger or a maintainer fixes the version of the problem a jump pack only postpones. For the general case rather than a diesel, best jump starters is the shorter answer, and how to jump start a car is the procedure.

Every pick, with the working

Each entry lists the specifications the maker publishes, the axis scores those specifications produce, and what you give up. Rows that read “Not published” are not omissions on our side: they are things the maker will not commit to in writing, and they cost the product points on the transparency axis. Specifications compiled September 4, 2026.

Our pickThe published diesel ceiling you can trust

NOCO Boost GB70

6.8/10

2000 peak amps, and NOCO states what that means in the only units that answer the question: engines up to 8.0L gas and 6.0L diesel, up to 40 starts per charge. It publishes a weight (5.0 lb), an IP65 rating, a recharge time (6 hours) and the patented spark-proof and reverse-polarity interlock that is the reason to buy a NOCO at all. It is also the worst amps-per-dollar figure on this page, and NOCO publishes no capacity figure anywhere.

Peak amps: 2000 A
Published engine ceiling: 8.0L gas, 6.0L diesel
Starts per charge: Up to 40
Weight: 5.0 lb
Ingress rating: IP65
Recharge time: 6 hours
Safety interlock: Patented spark-proof and reverse-polarity protection
Flashlight: 400 lumen, 7 modes
Warranty: 1 year limited
Capacity: Not published
Operating range: Not published

List price $199.95 per Amazon listing, November 7, 2026, captured on the compile date below. Not a live price and not what you will pay — the button is where the real number is.

What it gets right

Published engine ceiling in displacement, not just amps: 8.0L gas and 6.0L diesel
Publishes starts per charge (up to 40), weight (5.0 lb) and recharge time (6 hours)
IP65-rated housing with rubberized over-molding, published
Patented spark-proof and reverse-polarity protection - the specification that matters for a tool used once every three years in the dark
400-lumen LED with 7 modes, and a USB power bank

Flaws

2000 A for $200 against 4000 A for $80 elsewhere on this page. Peak amps are unstandardized, but that is a wide gap to explain
No capacity figure published at all - no Wh, no mAh - so there is no way to compare its reserve against anything
1-year warranty, against 18 months and 2 years from cheaper rivals
No cold-weather behavior published, on a product bought for cold mornings

The working behind the 6.8

Heat headroom: not scored (weight 22%): The maker publishes no operating-temperature ceiling, so this axis is dropped and the other weights are re-normalized.
Install effort: 10.0 (weight 24%): Plugs into a 12V socket or a USB port. Nothing to mount, nothing to route, reversible in a second.
Price against the ceiling: 3.5 (weight 24%): Listed at $199.95 on the compile date. This site's buyer has a practical ceiling around $150 for a single upgrade, so the scale rewards everything under $100 and falls away sharply past $150. The live price is very often different, and that is what the button is for.
Written commitment: 5.5 (weight 15%): 12-month warranty. This is the only promise in the entire listing that a court would read, which is why it is scored and the marketing copy is not.
Spec transparency: 8.2 (weight 15%): 9 of the 11 specifications we went looking for are published by the maker (82%). A blank row is never a guess here: it prints “Not published” and it costs the product points, because a figure nobody will commit to in writing is a figure you cannot check.

Axes with no published input are dropped and the remaining weights re-normalized, so a product is not punished for a category where an axis does not apply. Specifications compiled September 4, 2026 from the NOCO GB70 listing.

$199.95 - view on Amazon#ad How we earn

2The only published cold-start mechanism

Hulkman Alpha 85S

7.4/10

The only jump starter in this ledger that publishes both a cold figure and the mechanism behind it: Hulkman states the pack pre-heats its own cells so it can deliver a start at -40 F. Every other unit here either publishes a cold limit with no explanation or publishes nothing. If the reason you are buying is January, this is the one that addresses January in writing.

Peak amps: 2,000 A
Battery: 74 Wh lithium
Cold capability: Pre-heat technology, stated start at -40 F (-40 C)
Engine ceiling: Gasoline to 8.5 L, diesel to 6.0 L
Starts per charge: Up to 60
Recharge: 65 W: 0-80 percent in 1 hour, full in 90 minutes
Display: 3.3 in screen with status and error codes
Ingress rating: IP65
Weight: 3.67 lb
Warranty: 24 months
Operating ceiling: Not published

List price $189.99 per Amazon listing, October 17, 2026, captured on the compile date below. Not a live price and not what you will pay — the button is where the real number is.

What it gets right

Pre-heat technology published, with a stated -40 F start capability - the only cold-start mechanism named by any maker here
2000 peak amps and 74 Wh, rated to 8.5 L gas or 6.0 L diesel, up to 60 starts per charge
3.3-inch display showing charge, status and error codes rather than a row of LEDs
65 W charging: 0 to 80 percent in an hour, full in 90 minutes, and a 5-minute charge is stated to be enough for one jump
IP65 housing and a published 2-year guarantee

Flaws

The most expensive unit here by forty dollars
3.67 lb, the heaviest on this page
Pre-heating draws from the pack's own charge, so a flat pack in a cold car is still a flat pack
No operating-temperature ceiling published, only the cold figure

The working behind the 7.4

Heat headroom: not scored (weight 22%): The maker publishes no operating-temperature ceiling, so this axis is dropped and the other weights are re-normalized.
Install effort: 10.0 (weight 24%): Plugs into a 12V socket or a USB port. Nothing to mount, nothing to route, reversible in a second.
Price against the ceiling: 3.5 (weight 24%): Listed at $189.99 on the compile date. This site's buyer has a practical ceiling around $150 for a single upgrade, so the scale rewards everything under $100 and falls away sharply past $150. The live price is very often different, and that is what the button is for.
Written commitment: 8.0 (weight 15%): 24-month warranty. This is the only promise in the entire listing that a court would read, which is why it is scored and the marketing copy is not.
Spec transparency: 9.1 (weight 15%): 10 of the 11 specifications we went looking for are published by the maker (91%). A blank row is never a guess here: it prints “Not published” and it costs the product points, because a figure nobody will commit to in writing is a figure you cannot check.

$189.99 - view on Amazon#ad How we earn

3A published cold-temperature range

GOOLOO GP4000

8.2/10

A 10.0L diesel ceiling and a published operating range of -20 C to 60 C for eighty dollars. The range is the reason it is ranked this high: it is the only unit on this page apart from the Hulkman that publishes any cold-temperature behavior at all, and a diesel that will not start is almost always a diesel that is cold. The 4000-amp headline, on the other hand, is a number with no published test method behind it.

Peak amps: 4000 A
Published engine ceiling: All gas, up to 10.0L diesel
Operating range: -20 C to 60 C (-4 F to 140 F)
Starts per charge: Over 60
Protections: 10 named types, plus BOOST mode
Ports: 2 x USB-A (one fast), 1 x USB-C 5V/3A
Warranty: 18 months
Wall charger included: No
Capacity: Not published
Weight: Not published

List price $79.96 per Amazon listing, November 7, 2026, captured on the compile date below. Not a live price and not what you will pay — the button is where the real number is.

What it gets right

Publishes an operating range: -20 C to 60 C (-4 F to 140 F)
Published engine ceiling of 10.0L diesel, all gas engines
18-month warranty, longer than either NOCO here
Publishes starts per charge: over 60 on a full charge
10 named protection types, and a BOOST mode for a battery too flat to be detected

Flaws

4000 peak amps with no test method published - twice the NOCO GB70 figure at 40% of the price
No capacity figure published for this unit, though GOOLOO publishes one for its siblings
Wall charger is not included, per the listing
GOOLOO support is a seller channel, not a dealer network

The working behind the 8.2

Heat headroom: 7.5 (weight 22%): Published operating ceiling 60 C (140 F). A car parked in summer sun runs roughly 60-70 C inside, so 65 C and up is real headroom, 60 C is living at the limit, and anything under 55 C is a summer problem waiting to happen.
Install effort: 10.0 (weight 24%): Plugs into a 12V socket or a USB port. Nothing to mount, nothing to route, reversible in a second.
Price against the ceiling: 8.0 (weight 24%): Listed at $79.96 on the compile date. This site's buyer has a practical ceiling around $150 for a single upgrade, so the scale rewards everything under $100 and falls away sharply past $150. The live price is very often different, and that is what the button is for.
Written commitment: 7.0 (weight 15%): 18-month warranty. This is the only promise in the entire listing that a court would read, which is why it is scored and the marketing copy is not.
Spec transparency: 8.0 (weight 15%): 8 of the 10 specifications we went looking for are published by the maker (80%). A blank row is never a guess here: it prints “Not published” and it costs the product points, because a figure nobody will commit to in writing is a figure you cannot check.

$79.96 - view on Amazon#ad How we earn

4A published operating range at sixty dollars

GOOLOO GP3000

8.6/10

GOOLOO publishes a full operating range - -4 F to 140 F - which almost nothing in this category does, and it does it on a sixty-dollar pack. The 3000-amp peak figure is the number to be most skeptical of here, because peak amps are measured however each maker likes; the temperature range is the number you can actually use.

Peak amps: 3,000 A claimed, no measurement method stated
Battery: 16,000 mAh
Operating range: -4 F to 140 F (-20 C to 60 C)
Engine ceiling: Gasoline to 9.0 L, diesel to 7.0 L
Boost mode: Engages automatically below 9 V
Light: 400 lumens, SOS and strobe
Weight: 1.39 lb
Warranty: 18 months
Watt-hours: Not published

List price $59.99 per Amazon listing, October 17, 2026, captured on the compile date below. Not a live price and not what you will pay — the button is where the real number is.

What it gets right

Published operating range of -4 F to 140 F (-20 C to 60 C), the only full range on this page
States it starts at -4 F specifically, and that boost mode engages below 9 V
16,000 mAh with a 400-lumen light, USB-C and Quick Charge 3.0, and a 15 V port for a tire inflator
1.39 lb, by far the lightest unit here
18-month warranty published

Flaws

3000 peak amps on a 16,000 mAh pack is an eye-catching number with no stated measurement method
30 percent stronger than standard 2000A models is a comparison against no named product
Auto-sleep holds charge for a stated 18 months but the listing also says recharge every 90 days - the two statements sit two lines apart
No watt-hour figure published, only milliamp-hours, which makes it hard to compare against packs that publish Wh

The working behind the 8.6

Heat headroom: 7.5 (weight 22%): Published operating ceiling 60 C (140 F). A car parked in summer sun runs roughly 60-70 C inside, so 65 C and up is real headroom, 60 C is living at the limit, and anything under 55 C is a summer problem waiting to happen.
Install effort: 10.0 (weight 24%): Plugs into a 12V socket or a USB port. Nothing to mount, nothing to route, reversible in a second.
Price against the ceiling: 9.0 (weight 24%): Listed at $59.99 on the compile date. This site's buyer has a practical ceiling around $150 for a single upgrade, so the scale rewards everything under $100 and falls away sharply past $150. The live price is very often different, and that is what the button is for.
Written commitment: 7.0 (weight 15%): 18-month warranty. This is the only promise in the entire listing that a court would read, which is why it is scored and the marketing copy is not.
Spec transparency: 8.9 (weight 15%): 8 of the 9 specifications we went looking for are published by the maker (89%). A blank row is never a guess here: it prints “Not published” and it costs the product points, because a figure nobody will commit to in writing is a figure you cannot check.

$59.99 - view on Amazon#ad How we earn

5The safety design, in a bigger pack

NOCO Boost GB50

7.4/10

1500 peak amps, up to 30 starts per charge, spark-proof and reverse-polarity protected, IP65, 1-year warranty. NOCO's reputation rests on the connection being impossible to get wrong in the dark, which is a real benefit at six in the morning with a flashlight in your teeth. What NOCO does not publish, on this listing, is any temperature figure at all.

Peak amps: 1,500 A
Engine ceiling: Gasoline to 7.0 L, diesel to 4.5 L
Starts per charge: Up to 30
Safety: Spark-proof and reverse-polarity protected
Recharge: 5 hours
Light: 200 lumens, 7 modes
Ingress rating: IP65
Weight: Listing states 2.7 lb in the description and 3.33 lb in the weight field
Warranty: 12 months limited
Operating range: Not published

List price $149.95 per Amazon listing, October 17, 2026, captured on the compile date below. Not a live price and not what you will pay — the button is where the real number is.

What it gets right

Patented spark-proof and reverse-polarity protection - the connection is the part people get wrong
1,500 peak amps, up to 30 starts per charge, rated to 7.0 L gas and 4.5 L diesel
200-lumen light with seven modes including SOS and strobe
IP65 rugged housing with rubberized over-molding
1-year warranty and a named, established brand with US engineering stated

Flaws

No operating-temperature range or cold rating published on the listing
5-hour recharge, the slowest here by a factor of three
The listing describes a compact 2.7 lb form factor while the listing's own weight field says 3.33 lb
The most expensive unit here apart from the Alpha 85S, with the shortest warranty of the four

The working behind the 7.4

Heat headroom: not scored (weight 22%): The maker publishes no operating-temperature ceiling, so this axis is dropped and the other weights are re-normalized.
Install effort: 10.0 (weight 24%): Plugs into a 12V socket or a USB port. Nothing to mount, nothing to route, reversible in a second.
Price against the ceiling: 5.0 (weight 24%): Listed at $149.95 on the compile date. This site's buyer has a practical ceiling around $150 for a single upgrade, so the scale rewards everything under $100 and falls away sharply past $150. The live price is very often different, and that is what the button is for.
Written commitment: 5.5 (weight 15%): 12-month warranty. This is the only promise in the entire listing that a court would read, which is why it is scored and the marketing copy is not.
Spec transparency: 9.0 (weight 15%): 9 of the 10 specifications we went looking for are published by the maker (90%). A blank row is never a guess here: it prints “Not published” and it costs the product points, because a figure nobody will commit to in writing is a figure you cannot check.

$149.95 - view on Amazon#ad How we earn

6The biggest claim on this page

GOOLOO GT6000

7.6/10

Skip this one. The biggest claim on the page and the least evidence behind it: 6000 peak amps and a 12.0L diesel ceiling, with no test method, no conductor specification, no operating-temperature range and no warranty term published anywhere in the listing. The same brand's GP4000 publishes a cold-weather range and an 18-month warranty and costs sixty dollars less.

6000 peak amps and a 12.0L diesel ceiling for a hundred and forty dollars - three times the amps and double the engine size of a NOCO GB70 that costs sixty dollars more. It does publish the things GOOLOO usually publishes and NOCO does not: 27,000 mAh of capacity, a 1.4-hour recharge, a 24-month standby claim, a 100 W bidirectional port and a 15 V 10 A DC output. What it does not publish is any test method for the headline number, and no warranty term appears in its listing at all.

Peak amps: 6000 A
Published engine ceiling: All gas, up to 12.0L diesel
Capacity: 27,000 mAh
Recharge time: 1.4 hours at 100 W
Display: 3.2 in LED
DC output: 15 V, 10 A
Standby claim: 24 months
Flashlight: 400 lumen, 3 modes
Warranty: Not published
Operating range: Not published

List price $139.99 per Amazon listing, November 7, 2026, captured on the compile date below. Not a live price and not what you will pay — the button is where the real number is.

What it gets right

Publishes a capacity figure (27,000 mAh), which neither NOCO here does
100 W bidirectional USB-C, so it recharges in a stated 1.4 hours and will run a laptop
3.2-inch display showing state and readiness
15 V 10 A DC output for a tire inflator, published
24-month standby claim published

Flaws

No warranty term published in the listing
6000 A with no test method, on a device whose conductor specification is not published
No operating-temperature range published, on a cold-start product
The 12.0L diesel ceiling is the largest claim in this ledger and the least checkable

The working behind the 7.6

Heat headroom: not scored (weight 22%): The maker publishes no operating-temperature ceiling, so this axis is dropped and the other weights are re-normalized.
Install effort: 10.0 (weight 24%): Plugs into a 12V socket or a USB port. Nothing to mount, nothing to route, reversible in a second.
Price against the ceiling: 5.0 (weight 24%): Listed at $139.99 on the compile date. This site's buyer has a practical ceiling around $150 for a single upgrade, so the scale rewards everything under $100 and falls away sharply past $150. The live price is very often different, and that is what the button is for.
Written commitment: not scored (weight 15%): No warranty term published, so this axis is dropped and the other weights are re-normalized.
Spec transparency: 8.0 (weight 15%): 8 of the 10 specifications we went looking for are published by the maker (80%). A blank row is never a guess here: it prints “Not published” and it costs the product points, because a figure nobody will commit to in writing is a figure you cannot check.

$139.99 - view on Amazon#ad How we earn

Prices last verified November 7, 2026. They move constantly; the figure on Amazon when you click is the real one.

Questions people actually ask

How many amps do you need to jump start a diesel truck?

Peak amps are the wrong figure to shop on, because no maker in this category publishes a test method for them - the claims on this page run from 1,500 A to 6,000 A with no stated method behind any of them. Use the published engine-displacement ceiling instead. NOCO states 4.5 L of diesel for the GB50 and 6.0 L for the GB70; Hulkman states 6.0 L for the Alpha 85S; GOOLOO states 7.0 L, 10.0 L and 12.0 L across three packs. Match your engine's displacement, which is in the owner's manual, to a published ceiling above it.

Will a 2000 amp jump starter start a diesel?

Both 2,000 A packs on this page - the NOCO GB70 and the Hulkman Alpha 85S - publish a diesel ceiling of 6.0 L, which covers most consumer diesel pickups. The amp figure is not what tells you that; the published ceiling is. Note that the GOOLOO GP3000 claims 3,000 A and a lower ceiling (7.0 L) than the GP4000 at 4,000 A and 10.0 L, which is why comparing amp numbers across brands does not work.

Why do cheap jump starters claim more amps than a NOCO?

Because there is no published industry test. Every peak-amp figure in this category is self-reported by the maker using the maker's own method, and none of the six listings on this page states what that method was. What you can compare is whether a brand's claims are internally consistent: NOCO steps from 1,500 A / 4.5 L to 2,000 A / 6.0 L, while GOOLOO steps from 3,000 A / 7.0 L to 6,000 A / 12.0 L at a falling price.

Does cold weather affect a diesel jump starter?

Yes, and it is the reason most people buy one. Lithium cells deliver less current cold, and a diesel needs more cranking current cold. Only two units here publish anything about it: Hulkman states a pre-heat mechanism rated to -40 F on the Alpha 85S, and GOOLOO publishes an operating range of -20 C to 60 C on the GP3000 and GP4000. Neither NOCO on this page publishes an operating range at all.

Can you use a car jump starter on a diesel?

Only if its published ceiling covers your engine. A pack rated for a 4.5 L diesel on a 6.7 L engine may turn it over on a mild day and will not on a cold one, and repeatedly trying is how packs and clamps get damaged. Check the diesel figure specifically - almost every listing publishes a gas ceiling that is 1.5 to 3 L higher than its diesel ceiling.

Why a diesel needs a different pack

The claim ladder, and where it breaks

What this page ranks on

Who each one is for

Two things to get right before you need it

Every pick, with the working

NOCO Boost GB70

What it gets right

Flaws

Hulkman Alpha 85S

What it gets right

Flaws

GOOLOO GP4000

What it gets right

Flaws

GOOLOO GP3000

What it gets right

Flaws

NOCO Boost GB50

What it gets right

Flaws

GOOLOO GT6000

What it gets right

Flaws

Questions people actually ask

Sources