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Sounds like you have one of the transition Citicars - Batteries under the seat, but with a Dana differential and a 6HP motor.
At 48v about the best configuration you can get with your setup appears to be with 8v batteries - two under each side, and two straddling the motor. This would give about 6kWh, or about 24 miles. I have six 8v batteries to save weight, but have room for 8 batteries if I want to move things around as I have a Terrell axle. The original pattern was two under the driver, another two under the passenger, and four in the center in the 'swastica' pattern.
The batteries I use are US8VGC. It used to have 6v US 2200's which are about the same physical size. Some people use the grocery shelf for a few extra batteries. For 72v, you could put three 8v there, and six under the seat...
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