Will the ZEN Thermostat work without batteries?

No. The ZEN Thermostat needs 4 AA Lithium batteries installed in the display at all times.

If you have a "C" wire on your current system, this will power the system indefinitely and you won’t need to replace the batteries.

If you don’t have a C wire, the 4 AA Lithium batteries will keep ZEN powered for approximately two years.

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