How to reset motion sensors once you replace the battery : r/homesecurity
ADT LYNX Security Alarm System Battery 7.2V 1000mAh | OSI Batteries
DIY Alarm System Battery Replacement
NEW Casil CA1240 12V 4AH First Alert ADT Alarm System UPGREADE Battery 806593457418 | eBay
ADT Security Alarm 804302 Battery Replacement - UB1250 Universal Sealed Lead Acid Battery (12V, 5Ah, 5000mAh, F1 Terminal, AGM, SLA) - Includes TWO F1 to F2 Terminal Adapters - Walmart.com
How to Replace the Battery in your Window or Door Sensors | ADT®