# Known areas for change or alignment

As we learn of specific needs for specific use cases they will be noted here:

* PX4 BMS specification and working group discusses the need to provide 5V power to a drone before activating the actual battery power supply. The intent is to allow the host to identify the battery characteristics to avoid a catastrophic mismatch. Conceptually there is a need to supply 5V through the CAN /SBUS connectors to allow a host-side processor to power up and query the battery for compatibility with the drone. i.e. do not power up a 12S battery on a drone that only is designed for 3S or 4S

  * This functionality can be tested with the current revision of the board given a few jumper wires to the CAN/SBUS connectors. As built the +5V power is NC
  * Not clear if the battery can be asleep then woken up with a button press to supply power. 
  * The 5V supply MAY only need to power a small MCU on the host side and not the complete host-side FMU. The small MCU could do the BMS query and then choose to power up the battery if in compliance.

* May be a trend toward 4 LEDS to show battery gauge status visually. We have one RGB led which we intend to flash a sequence and color to show battery status

  * Extra LEDs could be added on the expansion header

* The BMS itself doesn't regulate charging current or voltage, and needs a simple CC/CV charger. It can however balance it's own cells and disconnect the load. This situation could be improved by making a charger that talks with the battery over CAN and helps properly manage current and voltage, or even additional circuitry on board to manage this. 


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