Thermostat batteries drain very quickly (within weeks) on a battery-powered Baxi smart thermostat.

Safety note: Battery replacement is low risk; observe polarity and dispose of batteries properly.

Steps to improve battery life:

• 1. Use quality batteries: Fit new, branded alkaline batteries of the recommended type. Avoid mixing old and new cells.
• 2. Optimize RF conditions: Improve RF signal by relocating the receiver or thermostat to reduce distance and obstacles.
• 3. Adjust display settings: Reduce backlight brightness and timeout in the thermostat settings if possible.
• 4. Check for firmware updates: Some updates improve power management.

When to call a professional: If batteries still drain abnormally fast, the thermostat’s power circuitry may be faulty and the unit should be replaced.