High frequency switching inverter with microprocessor control gives fully automatic charging and subsequent maintenance-charging to optimize battery life and performance. Gradually increasing start-up voltage protects discharged batteries from high-current damage. Suitable for standard SLI (Starting-Lighting-Ignition), Gel, AGM (Absorbed Glass Mat) and VRLA (Valve Regulated Lead Acid) batteries. Fully protected against short circuit, reversed polarity, faulty battery, incorrect battery voltage, current overload, thermal overload and low supply voltage. Aluminium case with handle and storage for clamps and clamp cables. Suitable for 12V 8-300Ah batteries, depending on model.