Further information BATTERY REPLACEMENT Shelf life: 5 years Operating time: 96 hours minimum (on Standby) 8 hours operating time (once triggered) The batteries will require replacing after five years, even if the unit has not been used. The expiry date is shown on a label on the base of the SART. If the SART has been activated other than for testing, then the battery should also be replaced immediately. The SART SA50 is shipped with non-hazardous batteries. The SART should be tested annually as a minimum.