Script to show battery status on terminal (root required)
Using only the alternative method @Firelord mentioned.
#!/system/bin/sh # might need to change to your sh bin
You are ALL very WRONG! Discharging ANY LiPo to 0V makes it puff up. Do it every day and your battery will suffer the very first week I guarantee. There is no "Battery Level Calibration". That is an imagined myth. The Battery % is a table of Voltage Vs. % Capacity, with some guard band to save your battery from total discharge, which will hurt ...