Universal Power Group 6V 4.5Ah F1 AGM Battery, 45953 at Tractor Supply Co.
Amazon.com: ExpertPower EXP1245 12V 4.5 Amp Rechargeable Battery for Security Systems : Automotive
6 Volt 4.5 Amp Lead Acid Emergency Light Battery
Universal Power Group 6V 4.5Ah Lithium LFP Battery at Tractor Supply Co.
Amazon.com: 12V 4.5Ah Sealed Lead Acid Battery ECI Power : Health & Household
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