What do the pinouts on my BMS's do?

[A.Justice]

I have a few BMS's and they all have extra pinouts. Two of the pictures are from a JBD-sp04s005, and one is from a generic brand, but looks similar to overkills. Does anyone know what all, or any, of these are for? The only one I figured out was for a switch to turn the bms on or off. Thanks in advance!

 

[WingNut]

On the JBD-sp04s005, B1, B2 & B3 are balance wire connections. 3.2V, 6.4V & 9.6V, ( B- 0V & B+ 12.8V )
H+ & H- are heater connections. Not sure that anyone has figured out how to use the heater connections yet.