As stated above you don't need to disconnect the ecu battery. You plug it in at the beginning of your flying day, charge as needed during the day, then disconnect once your flying day is over.
Just agree.No switch.
Jetcat ECU is also switching off when no receiver power and you may leave the battery connected for weeks.
in practice I charge the battery and do not connect it, so I know that it was charged; then I connect the battery to ECU before flying and leave it until I have to charge it again.