High frequency inverter with microprocessor control gives fully automatic charging specifically designed for lead calcium batteries. This inverter charges at a higher voltage than that required for a standard lead acid battery. 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 14-175Ah batteries.