GE Interlogix Simon XTi wireless Simon Xti Simon X Replacement Battery: BatteryClerk.com
Amazon.com : Replacement Battery for GE Interlogix Simon XTi Wireless Control Panel Simon XTi Control Panel Simon Xti/Simon Xti Alarm Panel,fits Part Number 600-XTI-BAT : Electronics
6V 1.2Ah GE Interlogix 60-914 Back-Up Battery for GE Simon 3 & GE XT Panel
Amazon.com: 6V 1.3Ah GE Interlogix 60-914 Back-Up Battery for GE Simon 3 : Health & Household
TAKOCI Replacement Battery for GE Interlogix Simon XTi Wireless Control Panel,fit Part no 600-XTI-BAT,2500mAh - Newegg.com