ZPC 12V 18AH Sealed Lead Acid (SLA) Battery - T3 Terminals at Chrome Battery – chromebattery
PS-12180F Power-sonic 12V 18AH SLA Battery
Mighty Max Battery 12V 18AH SLA Battery for Visions CP12180XRP Rechargeable Sealed Lead Acid 12180 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com