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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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