I installed 4-6 volt wet cell in my Quantum ws31. It is the Heighth of the 6 volt wet cells that mine was VERY tight on. On mine I had to remove the step covering them just to get the batteries in/out. Then, do some creative clearancing under the step. Had I known about this Apex AGM battery, I would have installed them. Their price is doable and they are shorter, 10.4" vs 11.25".
https://www.apexbattery.com/6-volt-g...-6v-205ah.html
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