What happens if the controller main batteries fail?
This shouldn’t happen as the battery state is reported on regularly to give ample time to change them. However, if the main batteries do approach the end of their life, the controller goes into back-up power mode before the main batteries actually fail. In back-up power mode, the controller is powered by its internal back-up battery. P2 remains fixed at a safe, pre-determined level and no further adjustments are made. The controller continues to record new data and retains all existing data and settings in its large 2Mb memory. However, it stops communicating with the i2O server.
