Jump starter with air compressor: check the compressor too
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Quick answer
A combo unit saves trunk space, but read both halves of the spec. NOCO's AX65 lists 2,000 peak amps for gas engines up to 8.0 L. Its 100 PSI compressor takes a flat tire from 0 to 40 PSI in about 2 minutes, but manual mode has a duty cycle of 5 minutes on and 30 off. Clore's lead-acid JNCAIR weighs 28.5 lb and needs recharging after every use and every 3 months. Inflate to the cold pressure on your door placard.
Two combo units and a separate compressor compared
| Spec | NOCO Boost Air AX65 | Clore Jump-N-Carry JNCAIR | NOCO AIR20 (compressor only) |
|---|---|---|---|
| Jump rating | 2,000 A peak; gas to 8.0 L, diesel to 6.0 L | 1,700 A peak, 425 cranking amps | None |
| Battery | 31.8 Wh lithium-ion | Sealed lead-acid | None; 12 V power through a 20 ft cord with clamps |
| Max pressure | 100 PSI | Not listed | 100 PSI |
| Airflow | 67 L/min | Not listed | 47 L/min |
| 0 to 40 PSI fill | 2.0 min (205/65R16 tire) | Not listed | 2.5 min (same tire) |
| Hose | 3 ft braided | 12 ft coiled, screw-on chuck | 3 ft braided, 20 ft power cord |
| Weight | 6.95 lb | 28.5 lb | 6.81 lb |
| Extras | 60 W USB-C, 100-lumen light, IP55 with ports closed | 68 in #2 AWG cables, 12 V outlet, voltmeter | 60-lumen light, auto-shutoff |
The JNCAIR is about 4 times the weight of the AX65 (28.5 / 6.95 = 4.1), but Clore pairs it with 68 in #2 AWG cables and a 12 ft hose, against the AX65's 3 ft hose.
Duty cycle: the spec most listings skip
Small compressors must rest to cool. NOCO publishes its limits:
- AX65, manual mode: 5 minutes on, then 30 minutes off.
- AIR20: 15 minutes on at 30 PSI, then 45 minutes off; manual mode 5 on and 30 off.
That is plenty for topping off a low tire, which NOCO times at about 22 seconds from 35 to 40 PSI on the AX65. Refilling several flat tires back to back takes longer once the rest periods are counted. Clore's manual says the JNCAIR's compressor has a thermal switch that can shut it down if it gets too hot, then resets itself after cooling.
Lithium vs lead-acid: weight and upkeep
- Lead-acid (JNCAIR): Clore says to charge it for 24 hours when new, recharge right after each use and every 3 months when stored, and warns that skipping maintenance charges can greatly shorten battery life. Its suggested recharge times run from 20 minutes after a jump start to 5 hours after a heavy discharge.
- Lithium (AX65): NOCO lists a 31.8 Wh lithium-ion pack charged by USB-C, and operating and storage temperatures of -4 to 122°F.
- Weather: Clore says the JNCAIR can be used in rain, snow, heat or cold but must not be submerged; NOCO rates the AX65 IP55 with its ports closed.
Whichever you choose, set a reminder to check the charge; a jump pack that sat flat in the trunk will not help.
Using one at the roadside
- Jump start: follow your unit's clamp order and safety steps. Clore says that if the engine does not start within 6 seconds, let the unit cool for 3 minutes before trying again.
- Find the right pressure: NHTSA says to use the cold inflation pressure on your vehicle's tire information placard or certification label. Cold means not driven for at least 3 hours.
- Warm tires: if you have been driving, NHTSA says to fill to the placard pressure anyway and recheck once the tire is cold.
- Set and fill: on the AX65 and AIR20, set the target and NOCO's auto-shutoff stops at that pressure.
- Recharge: top the unit up before putting it away.
Combo or two separate tools?
- Combo makes sense for one compact kit in a small car: the AX65 jumps, inflates and charges a phone from one 6.95 lb box.
- Separate tools make sense if you already own a jump starter, or want a compressor that never depends on a charged pack. NOCO's AIR20 runs on 12 V power through a 20 ft cord with clamps.
- Heavy-duty use: a lead-acid combo like the JNCAIR trades weight for long cables and a long hose, but needs regular charging.
For more jump starters without compressors, see our portable car battery jump starter guide.
What to look for when you buy
Compact lithium combo: NOCO Boost Air AX65
Best for: One small box that jump starts, inflates and charges a phone
NOCO lists 2,000 A for gas engines to 8.0 L and diesel to 6.0 L, a 100 PSI, 67 L/min compressor with auto-shutoff, 60 W USB-C and 6.95 lb.
Watch out: Manual-mode duty cycle is 5 minutes on and 30 off; the hose is 3 ft.
See options on Amazon (opens Amazon in a new tab)Heavy-duty lead-acid combo: Clore Jump-N-Carry JNCAIR
Best for: Trucks and farm vehicles where long cables and a long hose matter
Clore lists 1,700 peak and 425 cranking amps, 68 in #2 AWG cables, a 12 ft coiled hose, a built-in automatic charger and a 12 V outlet.
Watch out: It weighs 28.5 lb and Clore says to recharge after every use and every 3 months in storage.
See options on Amazon (opens Amazon in a new tab)Separate compressor: NOCO AIR20
Best for: Pairing with a jump starter you already own
NOCO lists 100 PSI, 47 L/min, 0 to 40 PSI in 2.5 minutes, auto-shutoff and a 20 ft cord with clamps for the vehicle battery.
Watch out: It draws up to 22 A at 12 V and cannot jump start; duty cycle is 15 minutes on and 45 off at 30 PSI.
See options on Amazon (opens Amazon in a new tab)Questions people ask
- Are jump starters with air compressors any good?
- They can be, if both halves fit your needs; check the engine rating, airflow, maximum PSI and duty cycle the maker lists.
- How long does a jump starter air compressor take to fill a tire?
- NOCO lists 2.0 minutes from 0 to 40 PSI on the AX65 and about 22 seconds to top off from 35 to 40 PSI.
- How often should I charge a jump starter with compressor?
- Follow the maker; Clore says to recharge its lead-acid JNCAIR after every use and every 3 months in storage.
- What PSI should I inflate my tires to?
- NHTSA says to use the cold pressure on your vehicle's tire information placard or certification label.
Sources
- AX65 Boost Air jump starter and air compressor, NOCO
- AX65 tech specs, NOCO
- AIR20 portable air compressor tech specs, NOCO
- JNCAIR 1700 Peak Amp 12V Jump Starter w/ Air System, Clore Automotive
- JNCAIR operator's manual, Clore Automotive
- Tires, National Highway Traffic Safety Administration