Which one is better for a diesel truck?

The GBX45. It is rated to 4.0L diesel versus 3.0L for the GB40, and its 1,250A and 31 Wh give more margin on a hard start.

Is the GBX45 worth the extra $36?

Yes if you want USB-C fast charging, a 60W laptop-capable power bank, or a diesel over 3.0L. For a gas sedan, the GB40 at $74.00 at eBay does the same job for less.

Which is easier to keep charged?

The GBX45. It fully recharges in 48 minutes over USB-C and can jump start after 5 minutes of charge. The GB40 charges over Micro USB and holds charge up to a year.

Which lasts longer between charges?

The GBX45 has the larger battery at 31 Wh versus 24 Wh. NOCO rates the GB40 at up to 20 jump starts per charge; the GBX45's bigger capacity gives more reserve.

Can either charge a laptop?

Only the GBX45. Its USB-C port delivers 60W in and out. The GB40's power bank is meant for phones and tablets over USB-A.

Do both have the same safety features?

Yes. Both use NOCO UltraSafe with spark-proof connections and reverse-polarity protection, and both are IP65 with ports closed.

NOCO Boost Plus GB40 Jump Starter vs NOCO Boost X GBX45 Jump Starter

Buy the GBX45 if you have a diesel over 3.0L, a big gas engine, or want fast USB-C recharging. Buy the GB40 if you want a proven, lighter, cheaper jump starter for a normal car. As of November 8, 2026, the GB40 is $74.00 at eBay and the GBX45 is $110.00 at eBay, so the GBX45 costs about $36 more.

Today the NOCO Boost Plus GB40 Jump Starter costs $36.00 less at its best price.

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