If your battery requires over charge and over discharge protection, there are several BMS manufacturers that we have worked with. Most UAV applications do not require over charge and over discharge protection. Shutting off power to a drone in flight is very dangerous. Most of our customers would rather risk damaging a battery versus crashing their drone. Most lithium balance chargers have over charge and over discharge protection built in. Most flight systems have this as well. Adding it to your battery becomes redundant for most applications.
If you are looking for additional features, here are BMS manufacturers we have worked with in the past:
