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225Ah is the capacity, kind of like how much "fuel" the battery holds; 225 amp-hours. That means each battery can provide 1 amp for 225 hours, or 225 amps for 1 hour, or anything in between; like 5 amps for 45 hours.
The motor in the golf cart probably wants around 100 amps at full load, so the run time on a fully charged set of fresh batteries would be around 2 hours and 15 min.
Good 12v marine deep cycle batteries are rated at about 120 amp-hours these days, so if you used 3 of those, you'd have a bit better than 1/2 the range or around 1 hour 12 min run time.
I'm really simplifying things here, but that's the jist of it.
You want to stick with deep cycle batteries as they are much better at resisting plate sulfation which happens when you run a lead-acid battery down to low charge levels.
Check out Costco or Sams; Last time I looked they had the group 27 size deep cycle marine batteries for around $80ish
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-John
'94 968 Iris Blue
'85.5 944 White - Rally Cross and wrenching practice
'84 944 Gemini Grey (gone, but missed...)
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