Cold Starts, Batteries & Jump Starters
Jump Starters for SUVs and Trucks
The rating that matters is not peak amps, it is the engine size the maker will stand behind. On a diesel that number is roughly half the gas figure, and that is not marketing caution.
Buy by the published engine rating, not peak amps. For a gas V8 SUV that means a pack rated to 7.0L or more; for a diesel pickup it means one rated to at least your engine size in the DIESEL column, which is always roughly half the gas figure on the same pack.
The gas number and the diesel number are different
Every pack publishes two engine ceilings, and the gap between them is large and consistent. It is the single most useful thing on the box and most buyers read only the first figure.
Note that the GB70 and the Alpha85 publish the same 2000A peak and different gas ceilings. That is exactly why peak amps is the wrong number to shop on - it has no standardized test behind it, so it is not comparable between manufacturers. The engine rating is the manufacturer stating what they will stand behind.
Why diesels take roughly half
A diesel has no spark plugs. It ignites fuel by compressing air until it is hot enough, which means compression ratios far higher than a gas engine - and the starter has to turn the engine against all of that compression before it will fire.
Add cold. Thick oil at 0F, plus glow plugs drawing their own substantial current before you even crank, and a diesel start is the hardest electrical job in ordinary motoring. The halved diesel ceiling on every pack in the table is the manufacturer being accurate rather than cautious.
Two practical consequences: let the glow plug cycle finish before cranking, and if your truck runs dual batteries, understand that a jump pack is supporting a much larger system than it would on a car. The mechanism behind cold starting generally is in why cars do not start in the cold.
The storage problem gets worse on a truck
Lithium packs deliver less current when cold, which is the central awkwardness of the whole category and is covered in lithium vs lead-acid. On a truck it bites harder for a mundane reason: bigger packs are heavier, heavier packs end up in the bed or a toolbox, and both of those are outside.
A GB70-class pack weighs enough that people stop carrying it in the cab. That is the moment it becomes a pack at outside temperature on the coldest morning of the year. Keep it in the cab if you possibly can - the cab is the difference between the rating on the box and what you actually get.
The air-compressor question
Several packs in this class bundle an air compressor, and on a truck that combination is more defensible than it is on a car. Truck tires are higher volume, they lose more absolute pressure for the same temperature drop, and a light-truck tire at low pressure under load is a real problem rather than a warning light.
The honest caveat is that a bundled compressor is rarely as good as a dedicated one, and it makes an already-heavy pack heavier. If tire pressure is your recurring winter job rather than starting, buy the two separately - the tire inflator picks are here.
The case for cables on a truck
Worth stating plainly, because it cuts against the product on this page: if you drive a diesel and you are usually around other vehicles, heavy 2 AWG cables outperform any consumer jump pack and have no cold derating and nothing to charge.
A pack earns its place when there is no second vehicle - a rural driveway, a job site at 5am, a trailhead. That is the situation cables cannot solve, and it is the only reason to carry the weight. Jump starter vs jumper cables works through the trade.
Do notassume a car-rated pack will start your diesel
A 1000A pack rated to 3.0L diesel will not turn over a 6.7L. It may crank it slowly enough to feel promising and then flatten itself, leaving you with a dead truck and a dead pack. Match the diesel column, not the gas one.
The short version
- Half-ton gas pickup or mid-size SUV: the GB50 at 7.0L gas is comfortable headroom.
- Full-size gas V8: GB70 or Alpha85.
- Any diesel: GB70 or Alpha85, both rated to 6.0L diesel. Nothing smaller.
- Skip: the GB40 for anything truck-sized. It is an excellent car pack and its 3.0L diesel ceiling is a real limit.
What to buy, and what to skip
We haven't tested these
No lab, no borrowed units, no free samples. What we did do: pull every published spec into one table and work out what the numbers mean on a cold morning. Everything below traces to a published spec sheet, a manual, or a standard we can point you at - and if a figure isn't published, we say so instead of estimating it. The full method is here.
Heads up: we earn a commission if you buy through the links on this page, at no extra cost to you. It never changes a ranking - here is how we pick and how the site is funded.
1. Best for diesel
NOCO Boost GB70 2000A UltraSafe Lithium Jump Starter
2000A and a 6.0L diesel rating. If your truck has two batteries and a block heater cord, this is the size that stops being optional.
Best for: Diesel trucks
What the maker publishes
- Peak current
- 2000A
- Engine rating
- Up to 8.0L gas, 6.0L diesel
- Safety
- Spark-proof connections, reverse polarity protection
- Extras
- USB power bank, integrated LED
- Operating temperature range
- Not published by the maker
What works
- 6.0L diesel is a real rating, and cold diesels are the hardest crank in normal use
- The extra capacity is also margin for a battery that is further gone than you thought
What doesn't
- Big and heavy compared with the GB40 - it is a trunk item, and cold trunks are bad for lithium
- Overkill and overpriced for a car
Skip this if: you do not own a diesel or a big-block V8. You are paying for amps you will never draw.
2. Biggest published rating
HULKMAN Alpha85 Portable Jump Starter, 2000A
A 3.3 in screen showing charge state and error codes. At 6am in the dark, a device that tells you why it is refusing to do anything is worth the extra bulk.
Best for: Seeing what is going on
What the maker publishes
- Peak current
- 2000A
- Engine rating
- Up to 8.5L gas, 6.0L diesel
- Jump starts per charge
- Up to 60, per HULKMAN
- Display
- 3.3 in screen for status, battery level and errors
- Operating temperature range
- Not published by the maker
What works
- The screen removes the guesswork that makes jump starters frustrating - it tells you whether the clamps are wrong or the pack is flat
- 60 jumps per charge is the highest published figure here
- 8.5L gas rating covers anything you are likely to be standing next to
What doesn't
- A screen is another thing to fail, and cold LCDs get sluggish
- No published operating temperature range on the listing
Skip this if: you want the smallest thing that works. NOCO makes a smaller pack and you will be more likely to keep it in the car.
3. Best for large gas engines
NOCO Boost GB50 1500A UltraSafe Lithium Jump Starter
Half again the current of the GB40 for the same handling. Cold cranking is where headroom stops being a spec-sheet number and starts being whether the engine turns.
Best for: Bigger engines and colder mornings
What the maker publishes
- Peak current
- 1500A
- Engine rating
- Up to 7.0L gas, 4.5L diesel
- Jump starts per charge
- Up to 30, per NOCO
- Safety
- Spark-proof connections, reverse polarity protection
- Extras
- 200-lumen LED with seven modes including SOS and strobe
What works
- Headroom is the point: a cold engine is thicker oil and a weaker battery at the same time, and both eat current
- 30 jumps per charge means it survives a season of lending it to neighbors
- 4.5L diesel rating covers most half-ton diesel pickups
What doesn't
- Costs meaningfully more than the GB40 for capability most sedans will never use
- Same lithium cold-performance caveat as every lithium pack here
Skip this if: you drive a four-cylinder commuter car. The GB40 is smaller, cheaper and enough.
4. Skip this for a truck
NOCO Boost GB40 1000A UltraSafe Lithium Jump Starter
The one most people should buy. 1000A, rated to 6.0L gas and 3.0L diesel, and small enough to actually live in the glovebox where a jump starter is any use.
Best for: Most gas cars
What the maker publishes
- Peak current
- 1000A
- Engine rating
- Up to 6.0L gas, 3.0L diesel
- Jump starts per charge
- Up to 20, per NOCO
- Safety
- Spark-proof connections, reverse polarity protection
- Extras
- USB-C power bank, 100-lumen LED with seven modes
What works
- Small enough to store in the cabin, which matters because a jump starter in a cold trunk is a jump starter with less charge
- Spark-proof and reverse-polarity protection turn the scariest part of jumping a car into a non-event
- Doubles as a power bank, so it earns its space the other 364 days
What doesn't
- Lithium cells lose deliverable current as they get cold, which is exactly the condition you bought it for - keep it inside, not in the trunk
- NOCO does not print an operating temperature range on the listing, so check the manual for your climate before relying on it at 0F
Skip this if: you drive a diesel truck. 3.0L of diesel is the published ceiling and a cold diesel is the hardest thing on this list to crank.
Questions people actually ask
What size jump starter do I need for a truck?
Match the published engine rating rather than peak amps. A full-size gas V8 wants a pack rated to 8.0L gas or more; any diesel wants one rated to at least your engine size in the diesel column, which is roughly half the gas figure on the same pack.
Why do diesels need a bigger jump starter?
A diesel ignites by compression rather than spark, so the starter must turn the engine against a far higher compression ratio. Add cold-thickened oil and glow plugs drawing their own current, and it is the hardest electrical job in ordinary motoring.
Is peak amps a useful number when comparing jump starters?
Not really. It has no standardized test behind it, so it is not comparable between manufacturers - two packs here publish the same 2000A peak and different engine ceilings. The published engine rating is what the maker will stand behind.
Should I get a jump starter with an air compressor for my truck?
It is more defensible on a truck than a car, because higher-volume tires lose more absolute pressure in cold. But bundled compressors are rarely as good as dedicated ones and add weight to an already heavy pack. If pressure is your recurring job, buy them separately.
Where should I keep a jump starter in a pickup?
In the cab, not the bed or a toolbox. Lithium delivers less current when cold, and a heavy pack stored outside sits at ambient temperature all night - which is exactly the morning you need its full rating.