Awesome thread!
I’m in the process of restoring a 1978 LawnBoy Supreme model 8237AE.
The battery for the electric start had given up the ghost, so I began looking around for a replacement. I discovered that if you can find one, it’ll cost you big time! (roughly $150 with the shipping).
I decided to see if I could rebuild the battery pack. When I opened it up, I found six lead acid batteries (2v each X 6 cells = 12v). The batteries are the size of standard D-size batteries, but have both terminal on the top. I searched and searched and finally found exact replacements for them. Once I knew what they were, I found a seller on eBay that sells them in 3-packs wired in series priced at $26.95 each ( $58 shipped).
After removing a plastic shield on top of the batteries (and removing the hot glue that was holding it on) I wired the 3-packs in series (required a 2 inch wire jumper) and moved the harness over from the old battery. Voila! A brand new battery pack at 1/3 the cost of a new one!
The batteries are called Enersys Cyclon and the part number is 0810-0102. I bought them from eBay seller hightechbattery.
I wanted to share this info in case any of you have one of these and need a replacement battery.
Bill