Hi all,
Thanks you all for the great info here.
I built my first LiPo battery from new drone batteries (Xiro Xplorer 11.1V 5200mAh) making a 10S4P battery pack.
(the drone batteries were 3S2P and a bargain at $15 each)
According to my calculations this is a 37V x 10.4Ah = 384Wh battery...