Best portable jump starters for 2023, tested:
CA measures this at 32 degrees F, while CCA measures this at 0 degrees F. For those of us that live in cold climates, the CCA rating is especially crucial. Your vehicle's battery also has CA and CCA ratings, typically located on the top. You'll want a jump starter with a CA and CCA rating near that respective number, which is usually around 400–500 for your average passenger vehicle.
If the jump starter is unable to sustain high amperage for 30 seconds to meet the standards of CA and CCA, the sustained amperage output is called "Starting Amps" or something similar. Figuring out the specs you need with these numbers can be very helpful in narrowing down which portable jump starter to buy.fleet doesn't consist of just brand new cars—there's a good group of clunkers out back that have been acquired over the years. To properly test these jump starters, we looked for a vehicle with a truly dead battery. We located one in athat worked perfectly.
Because the battery was drained each time we hooked a jumper to it, some of the jump starters would read the connection as a "reverse polarity" error . This was fascinating—but also unveiled a flaw with some of the new-style jump starters. Those without awould not recognize the connection, so they simply wouldn't work.
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