All of the Mannheim designed tractors had two 12 volt batteries hooked up in parallel, 12 volt system. This JD 2640 is 12 volt. Nothing after the 20 series was 24 volt in the Ag tractor side.
You did not say where you are located. If you get very cold then the single battery will not have enough cold cranking amps to start your tractor. If you are in the south or don"t use the tractor in cold weather then a single battery will work. Just don"t get a car battery. You need high cranking amps but a good reserve is more important. Example: some of the car batteries claim 1100 cold cranking amps but with only a 15 minute reserve. That will work fine is a gas engine application that need fast crank speeds but start quickly. Put that battery in your tractor and it will not crank long enough to get it started. A lower cranking amps with a longer reserve will work better.
One thing to do that will help the cranking on this tractor is to run separate battery cables to the starter. The original jumper under the clamp bolt was terrible at carrying cranking amperage. The replacement double ended cable is better but not as good as two good positive cables. Also ground the batteries to the starter mounting bolts. The original ones that went to the dash are junk.
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Today's Featured Article - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want … unless you own a monster tractor. U
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