Usually when you charge the X-mini Capsule Speaker, you can find out if it is charging or already finished charging from the colour of the LED on the bottom. 1) When charging note that the LED is RED in colour. 2) Once the unit is fully charged (The LED will change from RED to BLUE) 3) Doesn't matter if you left the speaker on or off as the LED will still follow the sequence.(RED- Charging / BLUE- Fully Charged) Regards, Fred