NOCO Boost GB20 500A 12V Lithium Jump Starter vs NOCO Boost GB40 1000A 12V Lithium Jump Starter
These are side-by-side facts taken from each product guide: published specifications, strengths and caveats as their sources state them. This page is not a test, a ranking or a verdict about which model is better.
NOCO Boost GB20 500A 12V Lithium Jump Starter
Gas engines up to 4.0 litres, motorcycles and powersport
The GB20 is NOCO's 500-amp pack on a 24 Wh lithium battery, rated for gas engines up to 4.0 litres. NOCO's own spec sheet lists diesel as Not Recommended. It ships with narrow powersport clamps, and its manual override for sub-2-volt batteries turns off both safety protections.
Published specifications
- NOCO: 500 A peak; gas up to 4.0 L; diesel listed as Not Recommended
- NOCO: 24 Wh lithium-ion battery; USB-C in and USB out at 5V 2.1A
- Guide: recharge about 3 h at 2 A, 6 h at 1 A, 12 h at 0.5 A
- Guide: no more than 5 consecutive starts in 15 minutes, then rest 15 minutes
- Guide: operate -20°C to +50°C; charge 0°C to +40°C; store -20°C to +50°C
- Box: GB20, powersport clamps, USB-C to USB-C cable, microfiber bag
Strengths
- Spark-proof and reverse-polarity protection in normal use, with an IP65 housing
- Powersport clamps reach the tight terminals on motorcycles and small machines
- NOCO publishes the full user guide, tech specs and warranty text for this model
Caveats
- NOCO's own spec sheet lists diesel as Not Recommended, and gas only to 4.0 L
- Manual override disables both protections and can push up to 500 amps
- Guide and specs page disagree on weight and size (2.4 lb vs 2.1 lb)
Read the full NOCO Boost GB20 500A 12V Lithium Jump Starter guide
NOCO Boost GB40 1000A 12V Lithium Jump Starter
Gas engines to 6.0L and diesels to 3.0L on 12V lead-acid
NOCO rates the GB40 at 1000 peak amps for gas engines up to 6.0 litres and diesels up to 3.0 litres, on a 24 Wh lithium pack. It is spark-proof and reverse-polarity protected in normal use — but the manual override that starts a battery below 2 volts switches both of those off.
Published specifications
- NOCO: 1000 A peak; gas up to 6.0 L, diesel up to 3.0 L; 12V lead-acid only
- NOCO: 24 Wh lithium-ion internal battery; USB in and out at 5V 2.1A
- Guide: recharge about 3 h at 2 A, 6 h at 1 A, 12 h at 0.5 A
- Guide: no more than 5 consecutive starts in 15 minutes, then rest 15 minutes
- Guide: operate -20°C to +50°C; charge 0°C to +40°C; store -20°C to +50°C
- NOCO: 1-year limited warranty, non-transferable; claim terms differ by guide version
Strengths
- Spark-proof and reverse-polarity protection in normal use, plus an IP65 housing
- Starts 12V lead-acid batteries down to 2 volts without the override
- NOCO publishes full specs, engine ratings and the complete warranty text
Caveats
- Manual override disables both safety protections and can push up to 1000 amps
- Guide limits you to five starts in fifteen minutes, then a fifteen-minute rest
- Warranty is non-transferable, and the two guide versions state different claim steps
Read the full NOCO Boost GB40 1000A 12V Lithium Jump Starter guide
How to choose between them
Choose the NOCO Boost GB20 500A 12V Lithium Jump Starter if your situation matches: Gas engines up to 4.0 litres, motorcycles and powersport. Its main caveat: NOCO's own spec sheet lists diesel as Not Recommended, and gas only to 4.0 L.
Choose the NOCO Boost GB40 1000A 12V Lithium Jump Starter if your situation matches: Gas engines to 6.0L and diesels to 3.0L on 12V lead-acid. Its main caveat: Manual override disables both safety protections and can push up to 1000 amps.
Both entries repeat what each guide records. Confirm the model, included parts and availability on the current listing before ordering.
Primary sources
- NOCO GB20 user guide and warranty, dated 03.07.2025A Source for NOCO Boost GB20 500A 12V Lithium Jump Starter
- NOCO tech specs page for the GB20 500A jump starter Source for NOCO Boost GB20 500A 12V Lithium Jump Starter
- NOCO GB20 how-to page with LED, button and troubleshooting tables Source for NOCO Boost GB20 500A 12V Lithium Jump Starter
- NOCO GB40 user guide and warranty, English section (listing-supplied copy) Source for NOCO Boost GB40 1000A 12V Lithium Jump Starter
- NOCO current GB40 user guide, dated 03.07.2025A Source for NOCO Boost GB40 1000A 12V Lithium Jump Starter
- NOCO tech specs page for the GB40 1000A jump starter Source for NOCO Boost GB40 1000A 12V Lithium Jump Starter
- NOCO product overview page for the GB40 Source for NOCO Boost GB40 1000A 12V Lithium Jump Starter
Primary sources checked .