Maintenance - SmartRelay AX Classic

An empty backup battery may cause the internal clock to stop in the SmartRelay AX Classic. We therefore recommend checking the time on the clock at regular intervals. A backup battery will last for about ten years if the power supply to the SmartRelay AX Classic is not interrupted. This battery should be replaced on a regular basis if the SmartRelay AX Classic draws on the backup battery at regular intervals due to frequent power failures.