The two AA batteries in your Sensor MoJo will last you between 3 months and 1.5 years, depending on your settings. While Sensor MoJo always samples sensors once every minute, other settings will change how long your battery lasts.

The main setting to be concerned with is the Report Rate. This controls how often your sensor connects to WiFi and reports its data to the cloud. Faster report rates will make the battery life shorter, and longer report rates will extend your battery life.

If you want to always be able to see the latest data, you should set your report rate to “Every 15 minutes”. This will ensure that when you go check for data, it will be at most 15 minutes old. But, this will mean your sensor will go through its batteries in about 3 months.

If you don’t want to check real time data as much, you can set the report rate to “Every Two Hours” . This will really extend the battery life, you’ll get 1.5 years or more.

While it doesn’t affect the battery as much, the Alarm Rate can also help you save power. The Alarm Rate controls how often you’ll get alarms when a parameter is out of bounds, and this means that the sensor will connect to WiFi to signal that alarm. Faster Alarm Rates will mean the sensor will wake up and signal an Alarm more often, and so will use the batteries faster. Likewise, slower Alarm rates will extend your battery life.

So, bottom line: Slow down the Report and Alarm Rates to get the longest battery lifetime.