Top suggestions for Battery replacement Put the alarm system on test first if it is monitored, so opening the detector doesn't create an unnecessary alarm/tamper dispatch. Remove the detector from its mounting plate. On the WLS912L-433, the DSC battery guide says to push the detector down if the LED is at the bottom, or up if the LED is at the top. Once separated, locate the two lithium batteries inside. Remove both old batteries. Install two fresh 3 V lithium batteries, carefully matching the + / − polarity markings in the detector. DSC specifically recommends observing the battery orientation. Snap the detector back onto its mounting plate. The detector should send a battery-restoral signal to the DSC receiver once the tamper is restored, clearing the low-battery trouble. 💡 Tip: Watch “DSC Wireless Glassbreak Battery Replacement” on YouTube for a video tutorial. |