Suppose If change the battery level to any desired value(say from current 50 to 20)
adb shell dumpsys battery set level 20
Now I want adb command to fetch the current battery level(ie 20).
With the below command I can reset to original value(50 in our example)
adb shell dumpsys battery reset
Now again I want fetch the current current charge level via adb command
For linux/macOS:
adb shell dumpsys battery | grep level
For Windows:
adb shell dumpsys battery | findstr /r /c:level