What type of batteries does the FocusPRO TH6110D require?
The thermostat requires fresh AA alkaline batteries. Batteries are optional if your thermostat was wired to run on AC power during installation. All settings other than time and day are permanently stored in memory and do not require battery power. (Page 17)
From the official Honeywell Focuspro Th6110d manual, page 17
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