If your app is telling you to check your batteries, there are three common scenarios you might run into.
Find the one that matches what you're seeing below, and follow the steps to resolve it.
Scenario 1: Batteries are empty
If the Airthings app shows your batteries as empty, replace all the batteries in the device with a fresh set of good-quality, non-rechargeable alkaline AA batteries (e.g. Duracell or Energizer).
We do not recommend lithium batteries. Our battery level indicator model is calibrated based on the discharge curve of alkaline batteries. Lithium batteries discharge differently, so the battery percentage shown in the app will not be accurate, even though lithium batteries can last longer.
We do not recommend rechargeable batteries. Rechargeable (NiMH) batteries run at a lower voltage (1.2V vs. 1.5V for alkaline) and have less capacity, so they will not last as long.
After replacing the batteries, it can take up to an hour for the new battery level to be reflected in the app.
Scenario 2: One battery bank has disconnected
During transportation, or after a shock or drop, a battery can get dislodged inside the compartment, which disconnects one of the battery banks and can cause the device to believe that the batteries are low.
To fix this:
Remove all the batteries from the device.
Inspect the metal battery contacts inside the compartment and make sure none of them show signs of corrosion.
Reinsert all the batteries, making sure each one is seated firmly and the polarity (+/−) is correct.
Scenario 3: Corrosion from a leaking battery (rare)
In rare cases, a battery that has been left in the device after running empty can leak over time. This shows up as white or bluish-green crystal deposits on the battery or the metal contacts. This is a low-frequency issue and is not dramatic, it's a normal effect of alkaline batteries left depleted for an extended period, and it's easy to fix.
To fix this:
Remove all the batteries and dispose of the leaking one(s) according to your local battery recycling guidelines.
Dip a cotton swab (Q-tip) in high-concentration isopropyl alcohol (90% or higher) and gently clean the crystal residue off the metal contacts. High-concentration isopropyl alcohol is recommended because it dissolves the residue and evaporates quickly without leaving moisture behind that could cause further corrosion. Avoid water or household cleaners for this step.
Let the contacts air-dry fully for a minute or two.
Insert a full set of brand new, good-quality alkaline batteries.
💡 For general information on battery type, life expectancy, and maintenance, see our battery life and lifespan guide.