Most Dyacon weather stations ship with a battery and solar panel. The 12 VDC 7 Amp-hour battery sustains the weather station over night and can even run the weather station for about one week without recharging.
All Dyacon weather station controllers have an embedded solar charge controller. The internal battery recharges each day using power from the solar panel.
The daily charge-discharge cycle gradually reduces the battery capacity. Batteries that operate in cold temperature environments or are deeply discharged will suffer more capacity loss than those that operate in room temperature conditions.
Weather station batteries take a lot of abuse and should be replaced routinely for reliable operation.
So, how do you know if your battery needs to be replaced?