The RAC 4Amp Smart Battery Charger is a fully automatic 6 or 12v battery charger with a capacity of 1.2-120Ah. The unit features a microprocessor controller with 5 stage intelligent charge, faulty battery indication, winter charging mode and maintenance mode. This smart battery charger is also ideal for diagnosis and rescue function for deeply discharged batteries down to 9V. The unit protects against reverse polarity charging, short circuit and thermal overload. To ensure the life of your battery health, the charger will automatically switch to float charge when battery is fully charged. This battery charger is also dust-proof and splash-proof rated to IP65 to protect against water damage. This battery charger is suitable for petrol and diesel engines up to 3000cc as well as wet, gel, AGM and maintenance free lead-acid batteries.