“CHG” -- Charging;   “DISCHG” -- Discharging; “ERROR” -- install the battery incorrectly or the battery is broken. EBL 906 battery charger can both recharge and discharge the batteries by switching the blue button below the LCD screen. Discharge and Charge: Press the blue button to discharge the battery. LCD displays "DISCHG". At the same time, 1-4pcs AA/AAA/C/D Ni-MH Ni-CD batteries automatically turn to discharging mode. The charger will resume charging mode after completion of discharge. Note: 9V batteries cannot be discharged. LED will not turn off when fully charged for 9V battery, please remove the 9V battery timely when fully charged.