The liter rating is the figure you can check against your own vehicle

Seven of the eight units here publish a ceiling in liters for the largest gasoline and diesel engine they are designed to start. The eighth, the DeWalt DXAEPS14, publishes only a cylinder count: 4-, 6- and 8-cylinder engines “up to V8”. A liter figure can be read against your vehicle’s displacement and compared; a cylinder count cannot, because it says nothing about displacement.

Read the diesel column if you drive a diesel. On six of the seven units with liter ratings, the maker’s own diesel ceiling is lower than its gas ceiling: by 2.0L on the GBX155, the Antigravity and the GOOLOO, 2.5L on the GBX45, 3.0L on the GB40 and 3.5L on the Weego. Only Clore rates both fuels at the same 10.0L. The makers are telling you, in their own figures, that the same unit covers less diesel than gas. Buying on the gas number for a diesel truck ignores that.

Peak amps, cranking amps and start assist amps are not one number

Clore’s 550 Start Assist Amps cannot be set against the GBX155’s 4,250A or the GOOLOO’s 4,000A, because it is not the same measurement. The closer comparisons are Antigravity’s 930A and Weego’s 440A, though the three brands label their sustained figures differently and the research for this guide found no shared definition, so even that is a comparison of labels.

The practical rule: use peak amps to compare units within one brand’s own line, where NOCO steps from 1,000A on the GB40 to 1,250A on the GBX45 to 4,250A on the GBX155, and use the liter rating to compare across brands.

Watt-hours are the reserve behind the headline, and half the field does not publish them

A peak-amp rating says how hard a unit can push; watt-hours say how much stored energy sits behind the push. Four of the eight publish a figure. The NOCO GBX155 states 99Wh, the Antigravity XP-20-HD 88.8Wh (24,000mAh), the NOCO GBX45 31Wh and the Weego 44s 27Wh. The NOCO GB40, DeWalt DXAEPS14, GOOLOO GT4000 and Clore JNC345 publish none.

No maker in the retrieved material converts watt-hours into a number of start attempts, so the figure only works as a relative comparison. Within the truck-class group, the two units that publish are close at 99Wh and 88.8Wh. The GOOLOO’s 4,000A peak and 12.0L rating sit on a battery whose size GOOLOO does not state. For a buyer whose worry is a cold engine that needs a second and third attempt, that is the largest documentation gap in this guide.

Cold floors: five published figures, one named mechanism, three blanks

For winter, the unit’s own operating range matters as much as the engine rating. Five units publish one. The NOCO GB40 states -22°F to 122°F (-30°C to 50°C), the lowest floor any maker here publishes for a unit as it ships. The NOCO GBX155 and GBX45 both state -4°F to 122°F (-20°C to 50°C). The Weego 44s states -4°F to 114°F.

The GOOLOO adds something no other unit here has: a named Battery Preheat Technology, stated to allow starts down to -40°F. That is a manufacturer description of a mechanism rather than a bare number, and it is why the GOOLOO scores highest on cold-weather operation despite sharing a -4°F general floor with three other units.

Three makers publish no operating range at all: Antigravity for the XP-20-HD, Clore for the current JNC345, and DeWalt for the DXAEPS14.

Charging temperature is a separate range, and NOCO is the only maker here to publish one: 32°F to 104°F (0°C to 40°C) for all three of its units. A NOCO left in a vehicle below freezing is inside its published operating range and outside its published charging range, so recharging it means bringing it somewhere warmer first.

Weight and chemistry: what the truck owner gives up for headroom

Seven of the eight use a lithium chemistry. NOCO describes all three of its units as lithium-ion, GOOLOO and Weego as lithium polymer, Antigravity as lithium with UL-listed cells, and Clore simply as lithium. The DeWalt is the outlier, a 12V sealed lead-acid battery.

Among the lithium units rated for 10.0L gas, weight varies by more than two to one. The GOOLOO is 2.4 lb. The Clore is 4.4 lb at about 13 x 6 x 6 in, per a retailer specification sheet rather than Clore’s own page. The GBX155 is 5.82 lb at 12.0 x 6.9 x 2.7 in.

Four units publish an IP65 housing rating: the three NOCOs with ports closed, and the Weego. Clore publishes conformance to UL2743. Published warranties run from one year on the GBX155 and the DeWalt to 24 months with a 180-day satisfaction guarantee on the Weego and up to 30 months on the GOOLOO; the GB40, GBX45, Antigravity and Clore publish no warranty term in the material retrieved.

When the compact unit is genuinely enough

If your vehicle is a compact or mid-size gas car, the three small units cover it on their own published ratings, and nothing in the truck group is needed. The Weego 44s is 0.70 lb and 5.62 x 3.44 x 1.04 in, with a 27Wh battery, a -4°F to 114°F operating range and a published 1,000 charge cycles. The NOCO GBX45 is 1.3 lb and 6.8 x 3.3 x 2.1 in, with 31Wh, a -4°F floor and the fastest published recharge in the guide. The NOCO GB40 is 2.4 lb and 6.7 x 3.2 x 1.7 in, with the lowest published floor at -22°F but no published watt-hour figure and a Micro-USB charging input.

Choosing among the three is a choice about which published figure you care about. The Weego leads on size, the GBX45 on recharge speed and documented capacity, the GB40 on temperature floor. The Weego’s 114°F upper limit is the lowest of any unit that publishes one, which matters more for a unit left in a vehicle in summer than for this guide’s winter buyer.

Who should not buy any of the three: a diesel owner whose engine exceeds 4.0L. The published diesel ceilings are 3.0L for the GB40, 3.5L for the Weego and 4.0L for the GBX45, the three lowest diesel figures in the guide.

Cable gauge: one published figure in eight

A truck battery can sit a long way from a convenient ground point, which is where cable thickness and length start to matter. Only Clore publishes either, for the JNC345.

Two model numbers whose listings disagree with the maker’s documents

DeWalt’s current printed instruction manual for the DXAEPS14 documents 1,600A peak and 750A instant boost on a 12V sealed lead-acid battery. Home Depot’s current listing for the same model number, and the Amazon listing, advertise 2,000 peak amps. No suffix separates the two, and no retrieved document says which a buyer receives. This guide scores the DeWalt on the manual’s figure and treats the 2,000A claim as unverified.

Clore’s JNC345 has a smaller version of the same problem: the Amazon listing title adds a 3000A figure Clore’s own page does not carry. For both, the manufacturer’s current page or manual is the figure to rely on, and a number that appears only in a retailer title is not a specification.