Hiya,
If I leave this running, will it shut off at a preset voltage so it won’t wreck my lipo? If so, at what voltage does it cut off?
There isn’t a low voltage cutoff built into the board, it relies on a protection circuit on your battery to disconnect when the battery gets low.
Got it! Looks like the batteries I bought on Amazon have LVC. 
https://www.amazon.com/gp/product/B08214DJLJ
For anyone else reading this - the wires on these batteries need to be reversed! First go around - magic smoke!