For some of these, the primary test was seeing how long I could power a small refrigerator before fully draining the battery. A fridge is a high-end, but common, use case for these units that ...

small-block-powered Chevy S-10 in 18°F weather ... 800 to 1,000 instantaneous amperages to kick-start a dead battery. These units all operate by using the lithium-ion battery’s high discharge ...