Honeywell 5000 and 6000 Series The former model takes AAA alkaline batteries, while the latter two take AA alkaline batteries. The battery compartment is on the side of the unit. In terms of battery replacement, the 6000 series is virtually identical except that it runs on AA batteries.Click to see full answer. Also asked, do old thermostats have batteries? Batteries Not Included Many thermostats still use batteries, while others draw power from your home’s electrical or HVAC system. The typical battery-powered dial, switch, digital or programmable thermostat is going to take regular AA or AAA alkaline batteries, a button-style 3V lithium battery or a 9-volt battery.Likewise, why Does My Honeywell thermostat need batteries? In general, batteries help to retain thermostat settings during power outages. A 24 volt C (Common) wire provides power to thermostats that do not use battery backups. Low batteries in digital thermostats are a common cause of issues preventing the heating and cooling system in your home from running. Also to know is, how do you change the battery in a old Honeywell thermostat? Honeywell 4000 series (Th4110D/ TH4210D) To remove and replace the batteries, pull at the bottom of the thermostat to remove it from the wallplate. Once removed, turn the thermostat over and insert 2 fresh AA batteries, and then reinstall the thermostat on the wallplate. Do Honeywell thermostats need batteries?Honeywell sells a variety of thermostats, and not all require batteries. A number of models do, though, and if you need to change your Honeywell thermostat battery, you need to know the model. If your thermostat doesn’t have a C-wire, it probably needs batteries.

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