When you use an Android Wear watch, which means that Bluetooth is usually always on my mobile. However, when the battery gets low, it’s a good practice to turn off Bluetooth to save power. With Tasker, you can let it be responsible for keeping track of the battery.
In Tasker, create a new Profile -> State.
Here, go to Power -> Battery Level.
Set a range for your battery, I’m using 0 to 20%, and then tap on the back arrow.
Tap on New Task, name it “Low Battery“.
Create a new Action -> Net -> WiFi.
Set WiFi to Off, and tap on the back arrow.
Create a new Action -> Net -> Bluetooth.
Set Bluetooth to Off, and tap on the back arrow.
Here, your phone’s battery goes below 20%, Tasker will automatically turn WiFi, and Bluetooth off. So, you don’t need to worry about the battery level on your phone, Tasker will take care of all that for you.