edit, I think balance current is around 50ma.
I have 10 of the SP14, and a couple of the SP17 models
They seem to have a fairly low standby current, and seem to evenly drain from all cells as opposed to just the first few.
I do disconnect the BMS if the pack is going to be unused for more than a month or so.
Last year I experimented with ldle drain current, I don’t have exact numbers, but it took roughly 6 months to drain a 13s ~300wh battery from 3.8 volts per cell to 3.0vpc.
Note that an active BT connection will pull more current, you can tell if BT is active when the blue LED is flashing on the BMS.
You can use the OverkillSolar app to get access to all the settings on the BMS.
JBD’s app after about version 3.1 is neutered to only allow access to the most basic settings.
JBD’s communication protocol is very well known and documented online.
I have a project that implements an ESP32 as a bluetooth esp-now bridge to get battery telemetry into any VESC based controller with a VESC-express.