[bushpilot]

as long as it is a 3 stage intelligent charger / maintainer you'll be fine -

I just looked at the Parallax website and all they talk about is temperature compensated charging - i don't see any specs nor do i read in the documentation where they state variable charging voltage based on battery condition.

if its a constant (average is the word they use) - then imo its a trickle charger and will require monitoring of the battery fluid level or it'll boil the batteries dry.