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#4 cable is plenty for a garden tractor. Most garden tractor solonoids are only rated at 100 amps so you aren't going to overload the cable. The cadet starters may draw a heavier load beings they are a starter generator combo, I've never had the pleasure but all the other little starters are not going to have a problem with #4 cable. Some of the import cars don't even use #4, #6 is enough. I have a car battery in both my sears tractors. I think they are a group 72, (I don't feel like going outside to look! *G*). The old one has a low amp charging system which seems to do just fine keeping the battery up. The new tractor has a 15 amp alternator and does just fine also. I also have a 500 amp invertor on the new one for out of the yard power (which is why I put the car battery in it) and it does just fine. garden tractor batteries don't last much longer than 2 years (neither do RV coach batteries)for good reasons, mostly because of being left to sit idle. CCA gives you an idea of how good the battery may be, and how well it will crank something at -20* F but it doesn't have much to do with how long they will last. Something that will go a lloonngg way to helping something start in the cold is to use synthetic oil. To close, let me say that you should not leave a low amperage charge on a battery for long periods of time. It is better to bring them back up every two or three weeks. and, it saves on your power bill.
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