We do recommend following the battery guidelines below. When you test the batteries what is the voltage testing at? How long have you had the thermometer and where was it purchased? If it does continue to eat batteries we may need to initiate a warranty claim once troubleshooting is exhausted.
Verify you are using fresh alkaline batteries or lithium batteries (when temperature is below -4oF/-20oC) in sensor.
Quality brand batteries are recommended, including Duracell, Rayovac, Energizer, or Kirkland.
Verify batteries are fresh. The battery expiration date should be at least 6 years out. Batteries can lose 3% power or more every year in storage.
Heavy duty, extra strength or generic / store brand batteries are not recommended for use with AcuRite products because they may cause performance irregularities due to the way these types of batteries disperse power. Each battery should not exceed 1.6 volts.
Rechargeable batteries are not recommended for use with AcuRite products because they may cause performance irregularities due to the voltage instability of these types of batteries.
Mixing different battery types (brands, old/new, etc.) is not recommended.