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+Most of the Hoverboard mainboards use a 10S2P LIPO Batteries (36v Nominal - 42v Charged ).<br />
+If you want to use a battery with less or more cells in parallel(at your own risk), change BAT_CELLS parameter in config.h (10 by default).
+
+## Battery level low alerts
+|Level|Single Cell Voltage|Beeps|Sideboard Led|
+|---|---|---|---|
+|LVL5|3.9v||Green blink|
+|LVL4|3.8v||Yellow|
+|LVL3|3.7v||Yellow blink|
+|LVL2|3.6v|Gentle beeps|Red|
+|LVL1|3.5v|Fast beeps|Red Blink|
+|DEAD|3.37v|Shutdown|Off|
+
+You can adjust the levels to your needs in config.h
+
+## Calibration:
+Battery voltage has to be calibrated to have a more accurate reading
+* Measure battery voltage with a multimeter and write the value * 100 to parameter BAT_CALIB_REAL_VOLTAGE in config.h
+* Read value 5 from [Debug Serial](https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/wiki/Debug-Serial) and write it to parameter BAT_CALIB_ADC in config.h
+* Save, compile and flash the board
+* Value 6 in Debug Serial should match with the measured battery voltage now
+
+## Troubleshooting:
+If the board is beeping
+* Make sure you have updated the number of cells in config.h if you use a battery with less parallel cells
+* With a battery of low quality/health, pulling a lot of current will result in a big battery voltage drop
+
+