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How long will the M221 battery hold the clock settings?

 The controller battery facilitates Clock settings to continue operating for up to 1 year when the controller is turned off. The controller does not have a rechargeable battery. The battery has an average lifetime of 4 years and should be replaced prior to its end of life. In order not to lose the data during battery replacement, change the battery within 120 seconds after the battery is removed from the controller.
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