Which Jump Starters Brand Wins?

at 7.6 V, by far the best of all brands tested, lasted about 3 seconds before auto shutoff

second best of all brands tested, but provided 13 seconds of boost versus 2 to 3 seconds for the other brands, by far the longest boost duration

at about 7 V, performed nearly the same as the NOCO, third best of all brands tested

at 5.6 V, lasted about 3 seconds, slightly below the Gooloo GP2000 despite a higher rated peak amp claim

at 7.2 V, lasted about 3 seconds before auto shutoff

at 5 V, the best bench result among the brands tested up to that point, lasted almost 4 seconds

only 410 amps at about 5.8 V, lasted about 2 seconds, weaker than the Gooloo GP2000 and iAmazing, and would not power back on after the test

at 4.4 V, lasted 3 seconds, described as not up to competing with the far less expensive, larger units

only 372 amps at about 3 V, discharged very quickly in about 2 seconds, weakest of the bench tested brands

very impressive, spun the engine over as fast as a 1,000 amp battery

very impressive, does not spin the engine as fast as some brands but keeps going without giving up

worked at ambient temperature but failed after an overnight freezer cold soak at 0F despite plenty of attempts

very impressive, no problem spinning the engine over

very impressive job

very impressive, no problem spinning the diesel engine over

spun the engine over but definitely not as fast as most of the other brands

got the engine to spin over a little bit but not enough to start it

delivered 67.1 Wh, by far the best of all brands tested, short of its 99.2 Wh rating

delivered 43.4 Wh, described as definitely not as good as some of the other brands despite its strong cranking performance

delivered 55.2 Wh, second best of all brands tested, behind only the Gooloo GP4000

delivered 53.8 Wh, better than the Gooloo GP2000 but still well short of its 74 Wh rating

delivered 45.9 Wh, short of its 73.3 Wh rating

delivered 48 Wh

delivered only 27 Wh, far short of its 44.4 Wh rating and worse than the two cheaper Gooloo and iAmazing units

delivered 27.2 Wh, just barely ahead of the Harbor Freight Viking, second worst of all brands tested

spun the engine over by far the longest of all brands tested, very impressive, down to two bars afterward

very impressive job, really spun the engine over

did even better than the Gooloo GP2000, kept the engine cycling for 7 to 8 seconds, down to 86 percent charge afterward

very impressive, spun the engine over very fast, would have started the vehicle with the coil connected, still had charge remaining afterward

very impressive, vehicle would have started, down to three bars afterward

failed, host had no luck getting it to work

spun the engine over slower than the other brands but did a respectable job for such a compact unit

did a lot better this year than in a previous test, definitely seen some improvements, though it needed a fully charged separate battery to activate since the near dead source battery would have taken about an hour to charge it

took a second to warm up then did a great job, definitely fast enough to start the tractor

did not like the cold and initially would not work, after warming up did get the engine spinning fairly fast and probably would have started it

performed well once warmed up from an initial temperature of about 4F

needed a few minutes to warm up, then did a really good job

failed even after about 10 minutes of warm up time, showed a warning light and would not cooperate

overheated at first, eventually did a decent job once warmed up though the spin was not very fast, may have started the tractor but probably not