12/24V Portable Battery Charger is used to charge lead-acid battery in small care and trucks.It is worked by transformer to lower the voltage,rectifier to rectify and then charge lead-acid battery by connecting overload protector on two heads of the battery.It has very simple and reliable circuit , lowers the machine faulty rate to min. Battery charger also has fast and slow charging switch, can fast charge battery and also protect from overcharging.The machine is good looking,novel and portable.