Jump Starters
Lithium vs lead-acid jump starters
Lithium is the right answer for almost everyone. The exception is specific enough to be worth knowing.
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How we assessed these: this comparison is built from manufacturer specifications and current retailer listings, not from hands-on testing of every unit. Figures we cannot source, we leave out.
Short answer
Buy lithium unless the pack has to live somewhere persistently hot. Lithium is a quarter of the weight, holds charge far better between uses, and is small enough to actually stay in the vehicle. Lead-acid's one real advantage is that heat does not permanently cost it capacity.
Lead-acid jump boxes were the whole category until about a decade ago: a sealed lead-acid battery in a plastic case with a handle, clamps and usually a compressor. They still exist, they still sell, and they are not simply obsolete — but the default has moved, for good reasons.
| Lithium pack | Lead-acid box | |
|---|---|---|
| Weight for a car-capable unit | About 2-3 lb | Typically 15-20 lb |
| Packed size | Door pocket | Dedicated trunk space |
| Charge retention between uses | Good — months | Poor — self-discharges steadily |
| Heat tolerance in a hot trunk | Poor — permanent capacity loss | Good |
| Cold performance | Reduced, still usable | Reduced, comparable |
| Can fly in carry-on | Yes, under 100 Wh | No |
| Usually includes a compressor | No | Often |
| Usually includes an AC outlet | No | Often |
| Cost per peak amp | Higher | Lower |
Why lithium became the default
Weight and size, decisively. A NOCO GB40 weighs 2.45 lb and is rated to 6.0 L gas engines. A lead-acid box with comparable starting capability is several times that. This is not just comfort: the tool that is genuinely small is the tool still in the vehicle in a year, and a jump starter on a garage shelf has a success rate of zero.
Charge retention. Lead-acid self-discharges steadily whether you use it or not, so a box left alone for six months is likely flat. Lithium holds charge for months. This is the failure mode that made lead-acid boxes frustrating to own: the tool bought for emergencies was routinely dead at the emergency.
Airline legality. Every mainstream lithium pack is under the FAA's 100 Wh carry-on threshold, including the 88 Wh GB150. A lead-acid box is not going on a plane at all.
The one place lead-acid genuinely wins
Sustained heat. High temperature permanently reduces a lithium cell's capacity — not a temporary reduction you get back when it cools, an irreversible one. A lithium pack that spends summers in a hot trunk or a metal bed toolbox is quietly losing the margin you paid for. Lead-acid is far less bothered by this.
So if the unit genuinely must live in a hot vehicle year-round, and you are prepared to top it up on a schedule, a lead-acid box is a defensible choice — and it usually brings a compressor and an AC outlet with it. That is the case the combo roundup makes in more detail. If the pack can live in the cabin or come inside for the summer, lithium wins outright. Storage and heat covers where to actually put it.
Capacity claims: read the units
Lead-acid boxes are usually described in peak amps and cranking amps. Lithium packs are usually described in peak amps plus a capacity, and that capacity is quoted either in watt-hours or in mAh. Watt-hours are directly comparable and are what airlines regulate; mAh without a stated voltage is not a capacity at all. mAh vs watt-hours shows the conversion, and peak amps vs cranking amps covers why the largest number on the box is not the one doing the work.
The picks
1. Best lithium for most drivers
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.
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Raw specifications: NOCO’s own page for the NOCO Boost Plus GB40.
2. Best lead-acid case
DEWALT DXAEJ14 Power Station
DEWALT · Best for one box that jumps and inflates
A lead-acid jump station with a built-in air compressor and a 120 V outlet — the combo box for people who would rather carry one heavy thing than two light ones.
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
- Jump starter, air compressor and AC outlet in a single case
- Lead-acid chemistry is untroubled by living in a hot trunk
- Handle-and-case format survives being thrown in a truck bed
What does not
- Heavy and bulky next to any lithium pack — the usual reason combo boxes end up in the garage
- Lead-acid self-discharges, so it needs topping up on a schedule or it is flat when you need it
- The built-in compressor is a convenience feature, not a match for a dedicated inflator's duty cycle
Skip it if
Not for anyone whose priority is packed size or carry-on travel. If the tool has to fit a door pocket or a suitcase, buy a lithium pack and a separate inflator.
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3. Best lithium at lead-acid capability
NOCO Boost Pro GB150
NOCO · Best for heavy diesel, fleet and equipment
The heavy end: 3,000 peak amps, a 7.0-liter diesel rating and 88 watt-hours, for the engines the consumer packs cannot legitimately claim.
Published specifications
What works
- The 7.0 L diesel rating is the highest in NOCO's consumer line
- 88 Wh still sits under the 100 Wh carry-on threshold, which is unusual at this size
- Long, heavy-gauge cables reach awkward battery positions on trucks and equipment
What does not
- 6.39 lb and bulky — a dedicated trunk or toolbox item, not a glovebox one
- Far more capacity than any passenger car will ever draw
Skip it if
Wrong tool for a car or crossover. If your largest engine is a half-ton gas V8, the GB70 already has margin and costs and weighs less.
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Raw specifications: NOCO’s own page for the NOCO Boost Pro GB150.
Key takeaways
- Lithium is a quarter the weight and holds charge for months, not weeks.
- Only lithium under 100 Wh can travel in carry-on baggage.
- Lead-acid's real advantage is heat tolerance, and it is a genuine one.
- Cold reduces both chemistries — it is an argument for margin, not for lead-acid.
- Compare watt-hours, not mAh; mAh with no voltage is not a capacity.
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
- Are lithium jump starters better than lead-acid?
- For almost everyone, yes: a quarter of the weight, a fraction of the size, far better charge retention between uses, and they can travel in carry-on baggage. Lead-acid's remaining advantage is heat tolerance, which matters if the unit must live in a hot vehicle year-round.
- Do lithium jump starters lose capacity over time?
- Yes, and heat is the main driver. Sustained high temperature causes permanent capacity loss, so a pack stored in a hot trunk will have less margin after a couple of summers than it did new. Keeping it in the cabin out of direct sun, and checking its charge before you rely on it, is the practical answer.
- Which works better in cold weather?
- Neither has a decisive edge — both deliver less current cold, as does the car battery you are trying to start. NOCO specifies its high-discharge lithium for use in any climate. The right response to cold is buying a pack with margin above your engine's rating, not switching chemistry.
- Why do lead-acid jump boxes include air compressors?
- Because the case is already large and heavy enough to house one, and the lead-acid battery can supply a compressor's sustained current comfortably. It is a genuine convenience — with the caveat that a built-in compressor's duty cycle is shorter than a dedicated inflator's.
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 Jump-and-Inflate Combo
Best With an Air Compressor
Combo units that jump and inflate — plus a frank accounting of what the built-in compressor gives up against a dedicated inflator.
Guide
Storage and Heat
Why a hot trunk permanently costs a lithium pack capacity, where to store it instead, and the one case where lead-acid genuinely wins.
Guide
mAh vs Watt-Hours
The conversion, worked through, plus why watt-hours is the only capacity figure that matters if the pack is ever going on a plane.
Best for Cold Weather
For Cold Weather
Winter picks with real margin, plus the one situation where a lead-acid box beats lithium and why lithium usually still wins.
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.