The cross-section in mm² is very nearly the whole specification

The best jump leads for 2026

Jump leads are sold on an amp rating that no standard governs and bought on two facts the good ones publish: the conductor cross-section in mm² and whether that conductor is copper or copper-clad aluminum. A thick-looking cable can be mostly insulation, and aluminum carries roughly two-thirds of what copper carries for the same section. After that, the clamps: jaws that reach around a terminal, springs strong enough to hold, and insulation that does not crack in the cold — which is when they are used. Length is a trade, since every extra meter costs voltage. We compare stated section and material, length, clamp construction and cold flexibility.

By Jean-Benoit Buisson

What we recommend

Einhell BT-BO 25/1 A LED SP

The pair with lights in the clamps — which matters because a car that will not start is almost always a car that will not start at night.

Conductor
31.4 mm (1.24 in)² aluminum, stated
Clamps
4 fully insulated pole clamps, stated
Lighting
LED-lit clamps for poorly lit conditions, stated
Engine size
Petrol engines up to 5500 cc, stated
Amazon reference
B01C8OUSMA
EAN
4006825603514
- LEDs in the clamps — the one genuinely useful innovation in this category
- Fully insulated clamps, which is what stops a dropped clamp shorting on a wing
- Aluminum carries roughly two-thirds of what copper carries for the same section
Best for: A boot pair for a petrol car, used at night more often than not.

≈ $58
Check price on Amazon
Schumacher Electric 3 m (10 ft) 16 mm (0.63 in)² leads

The compact pair: three meters and 16 mm (0.63 in)², which suits a small car and stores in a door pocket rather than a boot.

Length
3 m (10 ft), stated
Conductor
16 mm (0.63 in)² copper-coated aluminum, stated
Voltages
6 V, 12 V and 24 V, stated
Amazon reference
B0F1FL58L8
EAN
5425038532593
- Publishes length, section and material — all three
- 24 V capability at the lowest price here
- 16 mm (0.63 in)² is the smallest section here and limits current accordingly
Best for: A small petrol car, where compactness matters more than capacity.

≈ $87
Check price on Amazon
AEG SP 25 Alu-Tec

The pair that publishes engine sizes for both fuels: 5500 cc petrol and 3000 cc diesel, on a copper-aluminum construction.

Length
2 × 3.5 m (7 × 11 ft), stated
Section
Equivalent to 25 mm (0.98 in)² copper, stated
Voltages
12 V and 24 V, stated
Engine sizes
Petrol to 5500 cm (2165.4 in)³, diesel to 3000 cm (1181.1 in)³ — stated
Technology
Copper-aluminum, stated
Storage
Bag included, stated
Amazon reference
B006DUPW9A
EAN
4038373972040
- Publishes a diesel figure as well as a petrol one, which most leads avoid
- 3.5 m (11 ft) per cable gives more parking freedom than a 3 m (10 ft) pair
- "Equivalent to 25 mm (0.98 in)² copper" is a comparison rather than a measured section
Best for: A household with both a petrol and a diesel car.

≈ $105
Check price on Amazon
HELLA 4.5 m (15 ft) 35 mm (1.38 in)² leads

Length and section together: 4.5 meters (15 ft) of 35 mm (1.38 in)², which covers a large diesel and reaches a car parked awkwardly.

Length
4.5 m (15 ft), stated
Section
35 mm (1.38 in)², stated
Material
Copper-coated aluminum, stated
Engine sizes
Petrol to 7000 cc, diesel to 4000 cc — stated
Amazon reference
B07JKB78Z6
EAN
4082300745214
- The best combination of length and section here for the price
- A 4000 cc diesel rating covers vans and large estates
- Bulkier to store than the 3 m (10 ft) pairs
Best for: A diesel, a van, or anyone who has ever failed to reach with a 3 m (10 ft) pair.

≈ $145
Check price on Amazon
IWH 6 m (20 ft) 50 mm (1.97 in)² professional leads

The professional pair: six meters of 50 mm (1.97 in)² with solid cast clamps and stated DIN compliance — the set that ends the argument.

Length
6 m (20 ft), stated
Section
50 mm (1.97 in)² aluminum-copper, stated
Standard
Stated to meet DIN requirements
Clamps
Solid cast clamps, stated
Application
Petrol 12/24 V to 7000 cm (2755.9 in)³, diesel to 4000 cm (1574.8 in)³ — stated
Amazon reference
B07FWJG6NC
EAN
4045914756373
- Six meters reaches almost any parked car, at a section large enough that length costs nothing
- Solid cast clamps rather than pressed sheet — the part that fails on cheap leads
- Four times the price of the lightest pair here
Best for: A workshop, a van, or anyone who lends their leads to other people.

≈ $190
Check price on Amazon
Noone 2 AWG, 20 ft, UL clamps

The thickest and longest American lead here, with UL-listed clamps and a voltage readout.

Gauge
2 AWG — about 33.6 mm (1.32 in)² on the standard table
Length
20 ft (6.1 m)
Stated current
600 A instantaneous — no standard governs the figure
Clamps
UL listed, patented, covered in non-conducting rubber
Display
LCD battery voltage readout
Protection
Reverse polarity, with a red indicator
Temperature range
−40 °F to 140 °F
Supplied
Carry bag and gloves
Service
3 years after-sales — the longest term on this shelf
Conductor material
Copper-clad aluminum
Cross-section in mm²
NOT PUBLISHED
Engine sizes
NOT PUBLISHED
Amazon reference
B0C5CDD692
EAN
0723884696793
- 2 AWG is about 33.6 mm (1.32 in)², two and a half times the other American leads here
- The only UL-listed clamps on this shelf
- Publishes a gauge rather than the mm² figure this shelf asks for
Best for: A car parked awkwardly, by someone who wants to see the voltage climb

Check price on Amazon
Nilight 6 AWG, 16 ft, 450 A

A 6-gauge pair that publishes both ends of its temperature range and supplies gloves.

Gauge
6 AWG — about 13.3 mm (0.52 in)² on the standard table
Length
16 ft (4.9 m)
Conductor
Copper-coated aluminum (CCA), PVC sheath
Stated current
450 A instantaneous — no standard governs the figure
Temperature range
−40 °C (-40 °F) to 75 °C (−40 °F to 167 °F) — both limits published
Clamps
Fully PVC wrapped, jagged teeth, spring
Supplied
Storage bag and gloves
Stated vehicles
Small and compact cars, coupés, saloons, motorcycles
Cross-section in mm²
NOT PUBLISHED
Clamp jaw opening
NOT PUBLISHED
Voltage range
NOT PUBLISHED
Warranty
NOT PUBLISHED
Amazon reference
B0DHXWMNW7
EAN
0840323919654
- The only lead on this shelf to publish an upper temperature limit — 75 °C (167 °F)
- Names its conductor material, which two American leads here do not
- 13.3 mm (0.52 in)² is the thinnest section on this shelf, shared with three others
Best for: A compact or mid-size petrol car, with the leads left on while it idles

Check price on Amazon
Energizer 6 AWG, 16 ft, with bag

A 6-gauge pair at the lowest price for its length here, sharing its bullets with another brand.

Gauge
6 AWG — about 13.3 mm (0.52 in)² on the standard table
Length
16 ft (4.9 m)
Conductor
Copper-clad aluminum, thick vinyl coating
Cold flexibility
Stated flexible at −40 °C (-40 °F)
Clamps
Strong spring and a handle; vinyl coated
Supplied
High-grade travel bag
Stated vehicles
Trucks, SUVs, full-size, mid-size and compact cars
Packed size
280 × 276 × 79 mm (11 × 10.9 × 3.11 in), from the shipping record
Bullets
All five shared with the K KRIËGER KJC616 pair, slogan included
Upper temperature limit
NOT PUBLISHED
Amp rating
NOT PUBLISHED
Clamp jaw opening
NOT PUBLISHED
Amazon reference
B079LHNH8D
EAN
0841915003072
- $19.96, the cheapest 16-foot lead on this shelf
- Flexible at −40 °C (-40 °F), which is the temperature these are used at
- 13.3 mm (0.52 in)² of aluminum, the thinnest conductor on this shelf
Best for: A second car’s boot, where price and a bag matter more than section

Check price on Amazon
K KRIËGER 6 AWG, 16 ft, shelled clamps

The same 6-gauge pair as the Energizer lead here, with a shelled clamp and three dollars more.

Gauge
6 AWG — about 13.3 mm (0.52 in)² on the standard table
Length
16 ft (4.9 m)
Conductor
Copper-clad aluminum, thick vinyl coating
Clamps
Shelled vinyl-coated, with a spring and a handle
Cold flexibility
Stated flexible at −40 °C (-40 °F)
Supplied
High-grade travel bag
Stated vehicles
Trucks, SUVs, full-size, mid-size and compact cars
Bullets
All five shared with the Energizer ENB-616U pair
Slogan
Bullet 5 ends with Energizer’s own slogan
EAN prefix
Shared with the Energizer pair — 0841915
Amp rating
NOT PUBLISHED
Upper temperature limit
NOT PUBLISHED
Amazon reference
B0BQNCY2QT
EAN
0841915005694
- A shelled clamp body rather than a coated handle, unlike the identical cheaper pair
- Flexible at −40 °C (-40 °F), which is when jump leads get used
- $3.01 more than the same cable under another brand
Best for: The same cable as the cheaper pair, bought for the clamp shell

Check price on Amazon
CARTMAN 6 AWG, 12 ft, dual-grip

The shortest and cheapest pair here, with a patented dual-grip clamp and the narrowest cold rating.

Gauge
6 AWG — about 13.3 mm (0.52 in)² on the standard table
Length
12 ft (3.7 m) — the shortest on this shelf
Conductor
High-density copper-clad aluminum, stated high copper content
Clamps
Patented dual-grip, rubber insulated
Cold limit
−25 °C (−13 °F) — the narrowest on this shelf
Supplied
Carry bag
Stated vehicles
Mid-size cars, light pickups, light RVs
Warranty
Stated "hassle-free", with no period
Price
$18.99 — the cheapest lead on this shelf
Amp rating
NOT PUBLISHED
Clamp jaw opening
NOT PUBLISHED
Upper temperature limit
NOT PUBLISHED
Amazon reference
B09TQJVHM2
EAN
6943536315962
- The only patented dual-grip clamp on this shelf, rubber insulated
- 12 feet on 13.3 mm (0.52 in)² is the one 6-gauge lead whose length suits its section
- −25 °C (-13 °F), fifteen degrees short of every other American lead here
Best for: Two cars nose to nose in a mild climate, at the lowest price here

Check price on Amazon

Need by need, within jump leads

Reaching an awkwardly parked vehicle

Length decides whether two vehicles that cannot be brought nose to nose can be connected. That happens often in car parks.

IWH 075637

Getting the current through

The cable cross-section decides how much current actually gets through. Cables that are too thin get hot and will not crank a large engine.

IWH 075637

Who each family suits, across jump leads

Jump starting between vehicles: That is the whole purpose here, and it assumes a second vehicle is available. A self-contained jump starter does without one.
Diesel and large engines: The current needed is high. Thin cables become burning hot without passing enough to crank.
Recent vehicles: The onboard electronics impose connection precautions. The vehicle handbook comes before habit.

What you gain and what you give up, on jump leads

Cross-section against bulk: Heavy-gauge cables genuinely pass the current and are heavy and stiff, especially in cold weather. That is the price of effectiveness.
Length against voltage drop: Long cables let you position the vehicles and lose more voltage. The cross-section has to make up for the length.
Leads against a self-contained jump starter: Leads never go flat and assume a second vehicle; the jump starter is self-contained and has to be recharged. The two complement each other.

Frequent questions on jump leads

In what order do I connect the clamps?

Positive of the dead vehicle, positive of the donor, negative of the donor, then a metal earth point on the dead vehicle away from the battery. Never the last clamp on the negative terminal.

Why not put the last clamp on the battery?

The spark from the last connection would happen above a battery giving off hydrogen. It is the central precaution of the whole operation.

Are thin cables enough?

On a small petrol engine, sometimes. On a diesel they get hot without passing enough current to crank.

Should the donor vehicle be left running?

Leaving it running for a few minutes before cranking markedly improves the chances. Practices vary between manufacturers.

Can the electronics be damaged?

Reversing the polarity can destroy control modules. It is the most expensive mistake possible here.

In what order do I disconnect?

In the reverse order of connection, with the engine running. The last clamp removed is the first one connected.

What if the engine still will not crank?

Check the contacts, clean the terminals, persist less. A dead starter or battery is not fixed by repeated attempts.

Where does the negative clamp go?

On a metal earth point of the dead vehicle, away from the battery, not on its negative terminal. That keeps the spark away from the gases a battery can give off.

What stays with you, on jump leads

The last clamp goes on a metal earth point away from the battery: the final spark must never happen above the gases. Reversing the polarity destroys control modules, and cables that are too thin get hot without passing enough to crank a diesel.

Summed up: jump leads

Gauge: 2 to 6, on 5 of the 10 models.
Section: 25 to 50, on 3 of the 10 models.

The full table of jump leads

A column is opened only if four tools in five publish its value. Otherwise the table would compare what nobody has measured.

Model	Price	Length
Einhell 2030365	$58	—
Schumacher Electric 981037	$87	3 m (10 ft), stated
AEG 97204	$105	2 × 3.5 m (7 × 11 ft), stated
HELLA 8KS 236,691-001	$145	4.5 m (15 ft), stated
IWH 075637	$190	6 m (20 ft), stated
CARTMAN CM-BC0612-22	—	12 ft (3.7 m) — the shortest on this shelf
Energizer ENB-616U	—	16 ft (4.9 m)
K KRIËGER KJC616	—	16 ft (4.9 m)
Nilight 10161W	—	16 ft (4.9 m)
Noone SMBC006	—	20 ft (6.1 m)

Our guides on jump leads

Sources, and the way we rank

Specifications: manufacturer sheets for garage tools and the matching Amazon product pages. Prices and availability: Keepa. Every figure in this table names its source.

Most recent revision in this category: October 6, 2026.

The method applied to jump leads

Prices quoted in these summaries are dated readings. The live price is shown next to each product.