The type of honeywell thermostat batteries your model needs depends on which specific thermostat you own. For example, the Lyric Round uses one AAA lithium battery, while the non-Round Lyric uses three AA alkaline batteries that can last up to three years. These batteries maintain your settings during a power outage, one of the key thermostat battery reasons. For any other model, your user manual provides the exact battery specifications.
What honeywell thermostat batteries does your model need?
To find the right batteries quickly, check the quick-reference table below for common Honeywell models. The Lyric Round requires one AAA lithium battery, and the non-Round Lyric uses three AA alkaline batteries with an expected battery life of up to three years. For all other models, the user manual is your best source for exact battery type and quantity.
| Honeywell Thermostat Model | Required Battery Type |
|---|---|
| Lyric Round | 1 AAA lithium |
| Lyric (non-Round) | 3 AA alkaline |
| Other models | Check user manual |
Where to find the battery compartment
The battery compartment location varies by model, but you can find it by pulling the thermostat unit off the wall, pressing a tab, sliding out a compartment, or lifting a faceplate. These are the verified locations, replacing the vague "on the back" description often found in older guides.
How to change the batteries step by step
Follow these steps to replace the batteries in your Honeywell thermostat correctly:
- Open the battery compartment using the method described above (pull off wall, press tab, slide compartment, or lift faceplate).
- Remove old batteries from the compartment, noting the polarity markings.
- Insert new batteries, matching the positive (+) and negative (-) ends with the markings inside the compartment.
- Close the battery compartment securely until it clicks or sits flush.
How long do the batteries last?
Battery lifespan depends on the type and model. The non-Round Lyric can last up to three years on AA alkaline batteries. A low battery warning message or icon typically appears on the thermostat display about two months (or 60 days) before the batteries are completely depleted, giving you plenty of time to get replacements.
What about backup batteries?
Many Honeywell thermostats use a CR2032 lithium battery as a backup to maintain the internal clock and programming during power outages. This button cell battery is not the main power source but ensures your settings are preserved when the main batteries are removed or the power goes out, which can be especially important if the reason for two home thermostats means you have more complex zone settings to protect. It is generally recommended to replace the CR2032 lithium battery every 3 to 5 years to ensure reliable backup power.
