Hi Waterman,
Nice setup!
I dont really want to scrap the battery out, it appears to have so much potential while its sitting at 22.5 volts with no charge!
I could keep it charged, excercise it a bit, with a cheap-o inverter, then hope another one comes along...but batteries like this...for FREE, only happen once every blue moon.
However, another one would be the way to go, If I could find one used but in good shape, it would only be a bit more than another string of eight golf cart batteries!
Now If I can figure out how to get this thing off the back of the ol' pickup.... a chain fall and some stout timbers