IIRC it's CC, CV. It's set up so it needs a 12V input (presumably controlled by a BMS) but I fed it straight 12V via the second SB50. I cannot recall what happened end of charge but I can look in the manual and report back. I had the Thunderskys on a commuter bike that I turned into a drag racer in 2014 so it's been sitting awhile.
There are two small adjusting screws: one to control CV voltage and the other to control shut-off current. I liked this charger as it is isolated but once I moved to the higher voltage packs I couldn't use it.
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