diff --git a/Battery.md b/Battery.md
index 7d0bc84..458c5b2 100644
--- a/Battery.md
+++ b/Battery.md
@@ -18,6 +18,10 @@ You can adjust the levels to your needs in [config.h](https://github.com/Emanuel
 |LVL1|3.5v|Red Blink|Fast beeps|BAT_LVL1_ENABLE|
 |DEAD|3.37v||Power Off||
 
+## Inactivity timeout - Power Saving
+The board will automatically power off after approximatively 8 minutes of inactivity by default.<br>
+Parameter INACTIVITY_TIMEOUT can be used to set up the number of minutes of inactivity before power off. It is not very precise.<br>
+
 ## Calibration:
 Battery voltage has to be calibrated to have a more accurate reading, for this you need [Debug Serial](https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/wiki/Debug-Serial) to be active
 * Measure battery voltage with a multimeter and write the value * 100 to parameter BAT_CALIB_REAL_VOLTAGE in [config.h](https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/blob/master/Inc/config.h)