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I have the same issue with the Model 21205 Gen 2. You get a notification that the batteries are depleted and when you check the batteries with a meter it turns out that they are still good. Then you put the same batteries back in the battery compartment, read the battery status through the app by connecting to the device via Bluetooth or Wi-Fi and it will tell you that the batteries are at 100%. An hour later the device tells you that the batteries are down to 0% and the valve will not turn on or shut off. Very frustrating. The batteries are ok. It must be a glitch in the firmware. Will try to contact Orbit Support to see what they come up with.
