The ODrive consumes about 50mA when held in Reset. I think this is due to the DRV8301 still switching and providing 5V, which is then regulated to 3v3 for the STm32.
It occurs to me that if I were to connect a toggle switch between pin 55 of U4 and GND, I could switch off the SMPS and hold the ODrive in an extreme low-power state so that it would not discharge a battery over time. However my soldering skills are not /that/ good.
Is this something planned for v4?