Amazon.com: ML3-12 12V 3.4AH Sealed Lead Acid (SLA) Battery for BP3.6-12 : Health & Household
ML3-12 12V 3.4AH Sealed Lead Acid (SLA) Battery for BB BP3-12 - MightyMaxBattery
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
12v 12Ah 12 volt 12 Amp-hr SLA BATTERY - Walmart.com