The Gunson 77115 maintenance battery charger is a fully automatic, microprocessor controlled unit delivering a maximum charge rate of 2A . It is suitable for 6 or 12V batteries with capacities between 10AH to 80AH. It is a maintenance battery charger and as such is not suitable for charging severely discharged batteries. It charges in three stages, initially pulse-charging to assist with battery desulphurisation (if necessary), then brings the battery up to 100% capacity. The final stage is a ‘maintenance’ pulse charge (float mode) which will maintain the battery in a fully charged state without overcharging. It features short-circuit protection, overload current protection, and over voltage protection. The unit is provided with quick-connector leads that enable the use of the battery crocodile clips or (for long-term connection and extended use) the eyelet terminals which are connected direct to the main battery lead terminals. The 77115 is suitable for regular (sealed or unsealed) Lead Acid batteries and for AGM (absorbed glass mat) batteries used on motorcycles, cars and light commercial vehicles.