Rahimafrooz Batteries offers Optus maintenance free batteries that are specially designed to meet and conform to major international standards specifications. These are electrolyte filled and charged from factory, which ensures high performance. Features and benefits include negative calcium and positive antimony plate – negative calcium plates minimise electrolyte loss, no need of frequent top up; calcium and low antimonial grid alloy of 1.7 per cent ensures minimum water loss and lower maintenance. Radial grid geometry lowers the electrical resistance; polyethylene envelope separators enhance ‘cranking performance’ due to reduced resistance. An enveloped pocket separators prevent against short circuits. Built-in charge indicator facilitates the determination of the state of charge of the battery and built-in flame arrester vent plugs are specially designed which prevents water loss from evaporation. It has enormously high starting power even at very low temperature; calcium alloy gives the battery a very low discharge rate and environment friendly – all components are fully recyclable to protect the environment.