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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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