Voice alarm EN 54 Charger and batteries AKU-18-12

Sealed lead-acid battery, maintenance-free, with a designed lifespan of 10 - 12 years. Manufactured with AGM technology - the electrolyte is absorbed in highly porous fibreglass dividers placed between the plates. They use a gas recombination cycle that prevents electrolyte loss and allows the batteries to be used in rooms without forced ventilation, occupied by people. The self-regulating, one-way pressure relief valves prevent the case from exploding, avoiding excessive pressure build-up in the cells.