X2 on the highest CCA you can get. I went to my local TSC and got this one;
http://www.tractorsupply.com/mower-b...g-amps-4700042 it turns over my 14 HP well.
Other things I checked when I was having problems with mine:
grounds are all cleaned up, and tight.
Spark plug gap is correct
points are gapped correctly
I use 93 octane fuel in winter, it helps
park it inside, or get a heater for your rear end
I also put a batt. tender on my battery to ensure it's good before i want to start it.
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Daniel G.
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(May 1970) 147 w/an IH spring assist, 48" deck, 42" blade, 1969 73, #2 trailer, 10" Brinly plow and (on loan) Dad's #2 tiller.