Plain Buy Guides

As an Amazon Associate I earn from qualifying purchases. Links to Amazon on this page are affiliate links.

Jump starter guide

NOCO Boost X GBX45 1250A 12V Lithium Jump Starter

Check on Amazon

Gas engines to 6.5L and diesels to 4.0L, recharged from USB-C

NOCO rates the GBX45 at 1250 A peak for gas engines to 6.5 litres and diesels to 4.0 litres, on a 31 Wh pack that recharges in 48 minutes from a 60 W USB-C PD charger you supply. The guide, NOCO's specs page and the listing give three different weights.

Check this model on Amazon

Listing checked . Confirm the model, included parts and availability before ordering.

Published specifications

  • NOCO: 1250 A peak; gas up to 6.5 L, diesel up to 4.0 L; 12V lead-acid only
  • NOCO: 31 Wh lithium-ion; starts batteries down to 3 V
  • Guide: 0.8 h (48 min) recharge with a 60 W USB-C PD 3.0 charger
  • Guide: 60-second timeout; max 5 starts in 15 minutes, then 15-minute rest
  • Weight: 1.3 lb (guide), 2.16 lb (specs page), 2.64 lb (listing)
  • Guide: one-year warranty from purchase, or from serial date without receipt

Fit and limits

Strengths

  • 48-minute full recharge from a 60 W USB-C PD charger, per NOCO
  • Warranty still runs from the serial number date if you lose the receipt
  • USB-C input and output up to 60 W doubles as a power bank

Caveats

  • No wall charger in the box; fast charging needs a 60 W USB-C PD 3.0 charger
  • Manual override disables both protections and the 60-second timeout
  • Three different weights across the guide, NOCO's page and the listing

What NOCO rates the GBX45 for

NOCO rates the Boost X GBX45 at 1250 amps peak, for gas engines up to 6.5 litres and diesel engines up to 4.0 litres, on its overview and tech specs pages, and the listing uses the same figures. The guide's specification table also gives a 1250 A peak current rating and a 31 watt-hour lithium-ion internal battery, which matches NOCO's tech specs page.

The guide attached to this listing says the GBX45 is for jump starting 12-volt lead-acid batteries only. It is designed to start 12-volt lead-acid batteries down to 3 volts, and it describes a manual override for batteries below that, covered in the next section.

The listing's bullet says the 60-second timer delivers up to 6 jump starts per charge. That count does not appear in the guide pages we read, on NOCO's tech specs page or in the part of the overview page we read, so it rests on the listing alone; ask NOCO if the number of starts per charge matters to you.

Fast charging needs a 60 W USB-C PD 3.0 charger

NOCO's overview page says the GBX45 completely recharges in 48 minutes, or goes from 0% to jump starting in 5 minutes of charge, and the guide's recharge table gives 0.8 hours at a 60 W charger rating, which is the same 48 minutes. The listing bullet repeats 48 minutes.

The guide is explicit about the condition: a compatible charger capable of 60 W USB-C Power Delivery 3.0 is required to fully use fast charging, and the fast charge light comes on when the charge rate exceeds 15 W. Neither NOCO's box list nor the listing includes a wall charger, so that 60 W charger is yours to supply.

The guide calls the NOCO Auto Charger, sold separately, the most effective way to charge the unit, and says the vehicle must be running for it to fast charge. It also says to power the GBX45 on before plugging in a USB device you want to charge, because otherwise it will draw power from a dual-role USB-C device.

The 60-second timeout, the five-starts rule and override

The guide says a 60-second countdown starts as soon as a battery is detected, and once it ends the jump starting function is disabled until the unit is switched off and back on. The guide says the power LED turns orange after the timeout, while NOCO's overview page describes a yellow power LED for the same state.

It also sets a duty limit of no more than five consecutive jump starts within a fifteen-minute period, followed by a fifteen-minute rest. The troubleshooting table says that when the unit is too cold or too hot to jump start, only the flashlight is available.

For batteries below 3 volts the guide describes a manual override. Its caution says the spark-proof and reverse polarity protections are both disabled in that mode, the 60-second timeout is disabled, and the mode uses up to 1250 amps. We do not reproduce the procedure; it is in the guide.

Clamps that plug in, and what is in the box

The guide shows the battery clamps connecting to the GBX45 through its 12V OUT port, so the clamp lead is a separate part. NOCO's tech specs page lists the box as the GBX45, HD precision battery clamps, a USB-C to USB-C cable, a microfiber storage bag and safety and warranty information.

The listing's box block names the GBX45, heavy-duty jumper cable clamps, a USB-C charging cable, a microfiber storage bag and a 1-year warranty, and describes the unit as a power bank with 60 W USB-C Power Delivery. The guide lists USB-C input and output from 5 V up to 20 V at 3 A, and a USB-A output at 5 V, 2.1 A, 10 W.

NOCO's tech specs page gives the flashlight as 100 lumens, and the guide's interface page lists seven light modes. The guide gives the housing an IP65 rating with the ports closed, and cooling by natural convection.

Weight: three sources, three figures

The guide's specification table gives the weight as 1.3 pounds. NOCO's tech specs page gives 2.16 pounds (0.98 kg). The listing's product details give 2.64 pounds. None of the three says whether the figure includes the clamps, and neither NOCO document explains why it differs from the other.

Dimensions agree more closely between NOCO's documents: the guide gives 6.8 by 3.3 by 2.1 inches, and the tech specs page gives a height of 3.28 inches, width 6.83 inches and depth 2.08 inches. The listing gives 3.62 by 4.96 by 8.23 inches and does not say whether that is the carton.

The guide lists operating temperatures of -20°C to +50°C, charging at 0°C to +40°C and storage at -20°C to +50°C as an average temperature. Its troubleshooting table lists flash codes for connection to a system above 12 V such as 24 V, a failed internal cell, a charge timeout and back-charging in override.

Warranty: with or without a receipt

The guide attached to this listing gives a one-year limited warranty from the date of purchase, with repair or replacement at NOCO's discretion, subject to its technical support analysis. It is for the original purchaser from NOCO or a NOCO approved reseller or distributor and cannot be transferred. NOCO's tech specs page calls it a 1 Year Hassle-Free Warranty.

To claim, the guide says you first obtain a return authorization number from NOCO Support, then send the product with that number and your receipt, and the purchaser prepays packaging and shipping. Its Hassle-Free conditions say that with a receipt the year runs from the purchase date, and without one it runs from the serial number date, at no charge in either case.

The guide lists what voids the warranty, including misuse, improper storage, modification and disassembly or repair by anyone other than NOCO, and excludes normal wear, cosmetic damage and units with a missing serial number. It recommends registering at no.co/register to upload proof of purchase. Check the seller and condition of the offer you select.

Check the current listing

Check this model on Amazon

Confirm the model, included parts and availability before ordering.

Primary sources

  1. NOCO GBX45 user guide and warranty, English section (listing-supplied copy)
  2. NOCO tech specs page for the GBX45
  3. NOCO product overview page for the GBX45

Primary sources checked .

Compare with

Keep comparing

Use the jump starter guide index to compare other models, or read the full buying guide for category-level advice.