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 - Machine Shops - by Curtis Von Fange. It is a story that repeats itself countless times. In the process of rebuilding a particular section of the tractor there is a broken part for which a replacement cannot be found. The parts houses find in their catalogue that it is unavailable. The dealerships call it a discontinued part. Salvage yards define it as hard to find or, even worse, rare. Everyone on the NET says, 'what is it?' But don�t despair there is another avenue that can be used to get that piece repaired. The local mach
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