NOCO GB40 vs GB70 vs GBX155: Which Size Do You Need?

By Curbside Picks editorial team · Published 15 November 2026 · Last updated 15 November 2026

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NOCO's Boost packs are among the best-selling jump starters on Amazon.com. On 15 November 2026 the GB40 ranked in the top 30 of the whole Automotive best-seller list. The three models look alike but cover very different engines. Here's how they compare, using NOCO's own listing specs.

The short version

• Sedan, hatchback, crossover or small SUV (gas): GB40.
• V8 pickup, large SUV, or diesel up to 6.0L: GB70.
• 6.6L Duramax, 6.7L Cummins or Power Stroke, or anything up to 8.0L diesel: GBX155.

If you're between sizes, or the vehicle sits outside in a cold climate, go one size up. Cold weather makes every engine harder to crank.

Best for most cars and small SUVs

NOCO Boost GB40 (1000A)

Best for: Gas cars and small SUVs; small diesels up to 3.0L

• Peak current1,000A
• Engine ratingUp to 6.0L gas / 3.0L diesel
• Starts per chargeUp to 20
• RechargeAbout 3 hours (USB-C)
• Weight2.5 lb
• HousingIP65
• Flashlight100 lumens, 7 modes
• Warranty1 year

Things to know

• Not rated for heavy-duty diesels (6.6L/6.7L)
• No air compressor

Specs: Amazon.com listing (checked 15 November 2026). ASIN B015TKUPIC.

Check price on Amazon

Best for V8 trucks and mid-size diesels

NOCO Boost GB70 (2000A)

Best for: V8 trucks and mid-size diesels up to 6.0L

• Peak current2,000A
• Engine ratingUp to 8.0L gas / 6.0L diesel
• Starts per chargeUp to 40
• RechargeAbout 6 hours (USB-C)
• Weight5.0 lb
• HousingIP65
• Flashlight400 lumens, 7 modes
• Warranty1 year

Things to know

• Diesel rating stops at 6.0L, so 6.6L/6.7L trucks should size up
• No air compressor

Specs: Amazon.com listing (checked 15 November 2026). ASIN B016UG6PWE.

Check price on Amazon

Best for heavy-duty diesels

NOCO Boost X GBX155 (4250A)

Best for: Heavy-duty diesel pickups (6.6L/6.7L) up to 8.0L

• Peak current4,250A
• Engine ratingUp to 10.0L gas / 8.0L diesel
• Starts per chargeUp to 18
• RechargeAbout 2.7 hours via USB-C PD; 5 minutes for one emergency start
• USB-C output60W, two-way
• Flashlight500 lumens, 7 modes
• Warranty1 year

Things to know

• The most expensive pick in its group
• No air compressor

Specs: Amazon.com listing (checked 15 November 2026). ASIN B08WZFPXFM.

Check price on Amazon

Other differences that matter

• Weight: NOCO lists the GB40 at 2.5 lb and the GB70 at 5.0 lb. The GB40 is the one that really fits a glovebox.
• Charging: NOCO lists about 3 hours for the GB40 and about 6 hours for the GB70. It lists about 2.7 hours for the GBX155 over USB-C Power Delivery, plus "enough power for a jump start in just 5 minutes".
• Flashlight: 100 lumens (GB40), 400 lumens (GB70) and 500 lumens (GBX155).
• Power bank: all three can charge a phone. The GBX155 adds 60W two-way USB-C, enough for many laptops.
• None of the three has an air compressor. If you want one box for batteries and tires, see our jump starters with air compressors.

How we compared

All specs come from the NOCO listings on Amazon.com, checked 15 November 2026. We didn't test these units ourselves. Read how we research.

FAQ

Is the NOCO GB40 enough for a V6 truck?

NOCO rates the GB40 for gas engines up to 6.0L, which covers most V6 trucks. In very cold climates, the GB70 gives more headroom.

Can the GB70 start a 6.7L diesel?

NOCO rates the GB70 for diesels up to 6.0L, so a 6.7L is outside its rating. The GBX155 is rated to 8.0L diesel.

How long does a NOCO Boost hold its charge?

NOCO's listings don't give a single shelf-life figure for these models. Check the charge level each month or two and recharge after every use.

Do NOCO Boost packs protect against reverse polarity?

Yes. The listings describe spark-proof and reverse-polarity protection (UltraSafe) on all three.