Major feature Stable Quality and High Reliability: it can be withstands over charge and discharge, vibration shock and capable of extended storage. Maintenance -Free operation: No need to check the specific gravity of the electrolyte or add water. Heavy Duty Grids: the heavy duty grids MCA SLA battery an extra margin of performance and service life even deep discharge. Long service life (Float or cyclic). Low self discharge: Own to using of Lead Calcium grid alloy MCA SLA battery can be stored long time without recharge. Sealed construction: unique construction and sealing technique guarantee that no electrolyte can occur. Low pressure venting system: