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 CS 350 and 500 Users Manual PDF download
American Power Conversion (APC) - BK350EI - UPS, 230 VAC, 210 W, 350 VA, (3) C13 Out, IEC-320 C14 In, 8 min. Backup - RS