I had the same problem and snatched an “Etray” from the market section here a few days ago.
I think it is a good idea to disconnect the BMS from the battery in the mean time. I don’t know if that’s possible, but I suspect that my faulty BMS was the reason that my battery was discharged from half-full to dangerous levels within a few weeks.
(the initial problem was that my board wouldn’t turn off most of the time, once I moved the button from the BMS to the Focbox Unity and pressed it, the BMS sparked and started smelling -I stupidly reconnected it later on, to test it and left it connected).