This wouldn't help in SC, but for any readers in Canada...
I bought my JD755 new in 1998. The original Deere battery lasted about 3 years. It was replaced with a Canadian Tire model Motomaster Eliminator 10-2670-8, which I replaced today after about 8 years of Canadian winters. I was very impressed with the Canadian Tire battery. It was still starting the tractor, but starting had become difficult - lots of smoke, and harder to start as the temperature dropped. I first noticed this last winter but muddled through in the summer.
Today I chose a Canadian Tire model 10-3570. I would have chosen another 10-2670, but there is no such thing on their computer records! The clerk and I looked closely at my old battery to be sure it really said 10-2670. Go figure!
Anyway, the new model (10-3570) has very similar specs, and both have better ratings than the original Deere model which was rated at 491 Cold Cranking Amps at -18 Celsius, according to the Deere owner's manual.
The 10-2670 was about half an inch too short for the mounting location, but it worked out fine for 8 years or so. The new 10-3570 seems to fit perfectly.
Canadian Tire offers generous warranties for these batteries - but only if they are used in a car. For use in a tractor, the warranty is only six months!
The tractor started easily with the new 10-3570, but I won't be sure for a while whether my cold-weather hard-starting problem is fixed because the weather turned mild literally as I was out buying the battery today.