How often should I replace the battery in the Pro 5000 enclosure?
The 12V 4 amp hour battery (BAT-3) should be replaced every 2 to 2.5 years. The battery provides 1 hour of backup at maximum 2 amp current draw, or longer for configurations with lower current draw.
From the official Honeywell Pro 5000 Thermostat manual, page 16
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