Be aware that "cold cranking amps" have nothing to do with the "Amp-hour" capacity of the battery.
A typical car battery has around 50Ah (Amp-hours) of capacity. To charge it anywhere near capacity from flat dead, you need to put some number of Amps and hours together that multiplies up to make 50. Charging is not 100% efficient, so if you charged at 10 Amps for 5 hours, you'd only be putting 70-80% of the battery's capacity back. But that would be enough to start the car, and the alternator would finish the job as you drove around for a couple hours.
It really doesn't take that much to start a modern car. They fire almost instantly when you turn the key. A few minutes of 20A boosting can put enough of a surface charge on the battery to allow for one start.
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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