Hi Canoe,
I am fairly new to all this but this is what I have done. 2 X 8s 12ah headway packs in series for a total of 16s(only split them for mounting purposes on bike) No BMS. I bulk charge with a soneil 48v. 3.8amps cc up to 3.6v then holds cells at 3.6 cv and tapers the current to zero...