Procedure for extending the service life of a lead accumulator in a hazard alarm system

摘要

The accumulator bridges the electrical power supply for the hazard warning system for a predetermined time in the event of a mains failure, the accumulator, which is generally buffered, being monitored for its operational readiness. According to the invention, the accumulator is not connected to maintenance charging but is discharged at a low current down to a predetermined voltage or capacity value at specific time intervals and is then recharged, the voltage or capacity value for the discharging being defined such that the charge capacity of the accumulator is ensured for the intended bridging time.