SEM-Honeywell/ADEMCO Vista - Battery Replacement - My Alarm Center
My Alarm Center – How to Change the Backup Battery in a Honeywell Lynx Security Panel - YouTube
Synergy Digital Alarm System Battery, Works with Honeywell Lynx Plus Alarm System, (Ni-MH, 7.2V, 700mAh) Ultra High Capacity, Compatible with Honeywell 300-06868 Battery - Walmart.com