Well, I have finally done it, sadly its temporary.
I placed 3 of my ancient trojan T-875 8 volt batteries in place of the two 12v 1275's in the back of the ZX40 and my range went from roughly 18miles to 40 miles (possibly a little further but one battery goes lower than it should around 40 miles and I need to reduce speed)
With a 40miles range I can go two towns over and back, I can go anywhere in wausau and back, I can go to Mosinee and back. This is nice.
Sadly my top speed dropped from a peak of about 30-32mph down to around 28mph, the batteries have more capacity but at a slightly lower voltage so my speed is lower, that and they weigh more. If they didn't have 18,000 miles on them they might have a higher voltage
I stole the batteries from my C-car which has some shredded unlabled white wires that I am still trying to sort out (my C-car was running with burnt wires, very strange as I don't know what the disconnected devices did)
Now I really need to get a pair of replacement chinaman 101lb 150ahr AGM batteries @ $250 each I am waiting
Funny thing is I think I am drawing more than 150ahr 9.6kw used on a 48v pack and still 50% battery capacity something just aint right.
Too bad no one locally has a good test station, I would like to test one of these for its real capacity, it appears 150ahr is the rating under load to 50% capacity, if that is true we have a 300ahr AGM which at $250 is a steal.
Cheers
Ryan