Amazon.com: ExpertPower 12V 9Ah Compatible Battery Compatible with APC Back- UPS NS1250, NS 1250-2 Pack : Health & Household
OR-1290HR Battery 12V 9AH Eight Pack
Amazon.com: Replacement for APC Back-UPS 600 BN600 Battery - Replacement UB1290 Universal Sealed Lead Acid Battery (12V, 9Ah, 9000mAh, F1 Terminal, AGM, SLA) - Includes Two F1 to F2 Terminal Adapters :
APC Back-UPS RS BR1500G UPS Battery Set Replacement of 2 - 12V 9Ah | eBay
MIGHTY MAX BATTERY 12-Volt 9 Ah SLA (Sealed Lead Acid) AGM Type Replacement Battery for UPS Systems (2-Pack) ML9-12MP2 - The Home Depot
12V 9AH Sealed Lead Acid Battery for UPS/Surge Protector - 4 Pack - Walmart.com