As per the requirement for emergency lighting, DIN VDE 0108/10.89 Part 1 or EN 50171, stipulated the following requirements for batteries. “Annual endurance test outside operating hours.” It is mainly a discharge test where measurement of conductivity can be used as a supplement for collecting additional information about the battery system.
During the warranty period, weak batteries can be identified accurately. Mainly for certain installations e.g. Nuclear facilities, contact resistances of the connectors can be tested as prescribed among other things. A conductivity tester can be used for easy and reliable operation.
Source: — Elektrotechnik