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DSC System BD4-12 12V 4Ah Alarm Battery| batteryspecialist.ca
Amazon.com: AJC Digital Security BD 412 12V 4.5Ah Alarm Battery - This is an Brand Replacement
6V 4.5AH SLA F1 Terminal Sealed Lead Acid Battery for Exit Sign Emerge – Batteryhawk, LLC
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YUASA Battery NP4-12 12 V 4AH Battery
Mighty Max Battery 12V 5Ah 4ah Alarm System Back Up Vista 20P ADT Rechargeable Sealed Lead Acid 1250 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com