Which is better for a dead battery on a large engine?

The NOCO GB40. It is rated 1,000 amps for gas engines up to 6.0L and diesel up to 3.0L. The Rexing publishes no amp or engine rating, so it is the safer bet only for smaller 12V vehicles.

Does the Rexing replace a separate tire inflator?

Yes. It has a built-in 150 PSI compressor with an LCD pressure display and four nozzle adapters, so it inflates car, bike and motorcycle tires and sports balls. The NOCO has no inflator.

Is the Rexing worth the extra over the NOCO?

It usually is not extra. The Rexing ran $71.99 to $99.99 between October 31 and November 2, 2026, against $99.95 for the NOCO on October 28, 2026. You pay less and get two tools, but give up the stated jump-start rating.

Which lasts longer between charges?

The NOCO states up to 20 jump starts per charge and holds charge for up to a year. Rexing gives a 7,200 mAh capacity but no jump-start count, so the NOCO's claim is the more specific one.

Can either charge my phone?

Both can. The NOCO has a USB power bank output, and the Rexing has a USB-A output and recharges over USB-C.

Which is safer to connect in the wrong order?

The NOCO. It has spark-proof clamps and reverse-polarity protection. Rexing lists intelligent clamps but does not specify polarity protection.

NOCO Boost Plus GB40 Jump Starter vs Rexing 2-in-1 Jump Starter & Tire Inflator

Buy the NOCO GB40 if jump-starting is the job: it is rated 1,000 amps for gas engines up to 6.0L and diesel up to 3.0L, and it is spark-proof and reverse-polarity protected. Buy the Rexing if you want one device for both a dead battery and a low tire, since its 150 PSI compressor covers a job the NOCO cannot do. On price, the NOCO was $99.95 on October 28, 2026, and the Rexing ranged from $71.99 on October 31 to $99.99 on November 2, 2026.

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