Which one is better for a diesel truck?

The GBX45. It is rated for diesel engines up to 4.0L; the GB20 is rated only for gas engines up to 4.0L.

Is the GBX45 worth the extra money?

Yes if you need diesel coverage, a 6.5L gas rating, fast USB-C recharge or laptop charging. For a standard gas car, the GB20 does the job for about $46 less.

Which one is better for a motorcycle or ATV?

Both work. The GB20's 500A and 4.0L gas rating already cover most motorcycles and ATVs, so it is the cheaper choice.

Which lasts longer between charges?

NOCO says the GB20 holds its charge for up to a year. The GBX45 lists a 31 Wh capacity and a 48-minute recharge but no standby figure, so the GB20 has the clearer long-storage claim.

Can either charge a laptop?

Only the GBX45. Its USB-C port delivers 60W in and out, enough for many laptops. The GB20's power bank is aimed at phones and tablets.

Which handles cold weather better?

The GBX45 is rated to operate from 4°F to 122°F. NOCO does not publish a comparable operating range for the GB20, so the GBX45 is the safer pick for cold climates.

NOCO Boost Sport GB20 Jump Starter vs NOCO Boost X GBX45 Jump Starter

Buy the GBX45 if you need to start a big gas engine (up to 6.5L) or a diesel (up to 4.0L), or if fast USB-C recharging matters to you. Buy the GB20 if you drive a normal gas car, motorcycle, ATV or boat and want to spend less. As of November 8, 2026, the GB20 is $63.96 at Blain's Farm & Fleet and the GBX45 is $110.00 at eBay, so the GBX45 costs about $46 more.

Today the NOCO Boost Sport GB20 Jump Starter costs $46.04 less at its best price.

Ask our shopping agent

It checks today's price at every store, compares the alternatives and answers in about a minute.