The batteries last approx. 22 months. but with the Energizer Lithium >> Energizer Ultimate Lithium (4 pcs., AA, 3000 mAh)

So far, I have had to replace the batteries twice after 6 months. Note: The batteries last long after the indicator in the app shows red (empty). They then continue to run for about 1.5 months.

Batteries last a long time and are standard batteries. I am satisfied with my sensors (have all except wind).

The battery of the wind sensor lasts up to 2 years. No, there is no way to power the anemometer, rain gauge and outdoor temperature and there are no plans to do so, according to Netatmo. However, they all have at least 1 year battery life.