Allan,
I would 'think' about making a slip-over case of 'Glass cloth' and a resin that is resistant to the battery acid. You would have to make a mold for that 'part'. You could then clean the sides of the battery, pick it up, clean the bottom and place it in its' new little prophylactic. I'd make a bunch ... slip one one any or all ... safe sex in the battery house. No '30 minute' setting time needed.
They could be spot bonded on with the proper adhesive.
I tried to email this but your address is dead ... or at least the one I have is dead ...
Ron
Adventure is just bad planning." -- Roald Amundsen