are you wanting to make one or is it you just cant find one to buy???
if its the latter , if you give it a month till i give mine a good test i'll be knocking them out and they should be well under a £100 posted!
its not made with a started motor , so they will be light weight, the motors are meant to run for hours ,unlike the starter motors ,
you wont have to worry about discharge as much as they dont draw 30+ah like the starters
all i use is my standard two 7ah lamping batteries, but nothings going to happen till i get lots of testing done as i wont be ripping anyone
unlike the last p