๏ This 12 Volt, 5 Ampere Battery Charger is a simple Transformer based charger, used to charge a battery 5AH to 50 AH. ๏ When battery charger 2 Pin power cord connected with 230 Volt AC supply, and then Positive Red Clamp is connected with Positive Terminal ( i.e. +)of battery and Negative Black clamp is connected with negative terminal of battery( i.e. -)and then switch on the battery charger, and simply charge your battery. ๏ Charging Time of Battery: Output current of battery charger is only 5 Ampere, so charging time is depend on battery capacity: For Example: For 40AH Battery, time taken to charge: Output 5 AMP* 8 HRS(Approx.) For 30AH Battery, time taken to charge: Output 5 AMP *6 HRS.(Approx.) ๏ IMPORTANT NOTICE: Do not Connect Battery clamp in Reverse polarity with battery.