12V 7.2AH Sealed Lead Acid Home Security Alarm Battery 7.2ah, 8ah, 2 PACK 840140936339 | eBay
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Mighty Max Battery 12V 4.5Ah Home Alarm Security System SLA Battery Rechargeable Sealed Lead Acid 1250 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
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12 Volt 8 ah UB1280 Fire Alarm Battery replaces 12v 7.5ah