12V 9Ah Battery, Sealed Lead Acid battery (AGM), B.B. Battery HR9-12, 151x65x94 mm (LxWxH), Terminal T2 Faston 250 (6,3 mm)
UPG 12-Volt 9 Ah F1 Terminal Sealed Lead Acid (SLA) AGM Rechargeable Battery UB1290 - The Home Depot
Mighty Max Battery 12V 9AH SLA Battery Replacement for Generac YD9-12 Rechargeable Sealed Lead Acid 1290 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com