My 50.8v chargers go up to 58 and down to 12v with just the pot.
Still have a couple left, but saving for a 12 or 13s pack.
A charger turns of at end of cycle. (not all, I know)
Amy from OSN is hooking me up with 12v 20a chargers in the $50 range.
Ordered from her before. Very nice chargers. I've been running 4-10a-3.65 chargers from osn 24/7 for a couple weeks. Dumb chargers in that that they only used shunt diode and 30a fuse for pol protection. I test that every so often.