Amazon.com: Replacement Battery for BACK-UPS CS 350 BK350 - UB1290 Universal Sealed Lead Acid Battery (12V, 9Ah, 9000mAh, F1 Terminal, AGM, SLA) - Includes TWO F1 to F2 Terminal Adapters - CP1500AVRLCD :
Amazon.com: Replacement Battery for BACK-UPS CS 350 BK350 - UB1290 Universal Sealed Lead Acid Battery (12V, 9Ah, 9000mAh, F1 Terminal, AGM, SLA) - Includes TWO F1 to F2 Terminal Adapters - CP1500AVRLCD :
Back-UPS™ 350/500/650 CS
American Power Conversion (APC) BK350 APC® Back-UPS® CS Battery Backup System, | Baumann Paper
American Power Conversion (APC) - BK350 - UPS, 120 VAC, 210 W, 350 VA, (3) 5-15R Out, NEMA 5-15P In, 5.6 min. Backup - RS
MIGHTY MAX BATTERY 12V 8Ah SLA Replacement Battery for APC Back-Ups CS 350 MAX3943507 - The Home Depot