Only buy for 36V or lower, will fail on fully charged 48V packs
Bought 3 units and they all blew a trace when powered by a fully charged 48V battery (measuring 53.7V) with no load. Replacing the burnt trace with a wire bridge did not fix it, so the transistors are likely not up to spec.
They work well stepping down a 48V power supply, or battery packs 36V or lower.