Verdict
Head-to-head · Best Portable Jump Starters

NOCO Boost Plus GB40 vs NOCO Boost X GBX55

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

NOCO Boost Plus GB40 comes out ahead by a narrow margin (4.8 vs 4.7). The gap is mostly about daily drivers wanting reliable jump starter for sedans and SUVs — read the strengths below before deciding.

NOCO Boost Plus GB40
Higher ratedRanked #1 in Best Portable Jump Starters
NOCO Boost Plus GB40
$110

The Boost Plus GB40 is the best-overall pick — NOCO's flagship lithium jump starter for most cars.

Strengths
  • 1000A peak UltraSafe lithium-ion
  • Handles 6L gas + 3L diesel engines
  • Most popular jump starter brand
Watch-outs
  • Not for largest diesels (use GB70)
  • Lithium needs occasional topping
  • Premium pricing
NOCO Boost X GBX55
Ranked #5 in Best Portable Jump Starters
NOCO Boost X GBX55
$170

The Boost X GBX55 is the premium NOCO pick — flagship with USB-C PD and 12.5V boost mode.

Strengths
  • 1750A peak
  • USB-C PD charging port
  • 12.5V mode for hard-to-start engines
Watch-outs
  • Pricier than GB40
  • Newer model — less long-term data
  • Larger footprint

How they stack up

NOCO Boost Plus GB40

Best overall. Most popular. Premium price.

NOCO Boost X GBX55

Premium NOCO. USB-C PD. 12.5V boost.

Specs side-by-side

SpecNOCO Boost Plus GB40NOCO Boost X GBX55
Peak1000A1750A
Engine6L gas / 3L diesel
TechUltraSafe Lithium
BrandNOCONOCO
USB-CPD
Boost12.5V mode
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