Battery type Suitable for 2 or 4pcs of AA/AAA Ni-MH batteries & 1 or 2pcs of C/D Ni-MH batteries & 1 or 2pcs 9V Ni-MH batteries. Rugged Tested to be able to withstand drops of up to 1 metre on a variety of surfaces including concrete. Reverse polarity protection The charger protects the charger & batteries from being damaged by incorrectly installed batteries. Over current protection Maintain a constant charging current during the charging cycle. Low battery leakage current If the battery charger is not connected to input power & the batteries are left in the charger, the charger will discharge the batteries using a pre-determined current. Charging indicators LED display Constant power charging feature This feature by entering the power to achieve a constant charge current as the battery voltage change, consistent with the battery characteristics, & extend battery life. Charge Times AA Ni MH 2000m Ah = 13.3 Hours AA Ni MH 2300m Ah = 15.3 Hours AAA Ni MH 800m Ah = 6.4 Hours AAA Ni MH 900m Ah = 7.2 Hours 9V Ni MH 200m Ah = 12 Hours C Ni MH 3500m Ah = 21 Hours D Ni MH 5000m Ah = 30 Hours Electrical Performance & Tests Input Rated input voltage: AC 240V Frequency: 50 Hz Input power: P≤ 5.0W Standby power: <1.2W Charging current AA/AAA: 2 or 4pcs: 140m A ±40m A C/D: 1 or 2pcs: 180m A ±40m A 9V: 1 or 2pcs: 20m A ±10m A Charging voltage AA/AAA: 2.8V DC x 2 C/D: 1.4V DC x 2 9V: 9.8V DC x 2 Short circuit protection Io < 30m A