Amazon.com: Replacement for Battery 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 :
How to replace a battery in an APC Back-UPS CS 350 - YouTube
USED APC Back-UPS CS 350 Power Supply backup *NO BATTERY | eBay
Amazon.com: AJC APC Back-UPS CS 350(BK350) 12V 7Ah UPS Battery - This is an Brand Replacement : Electronics
Amazon.com: Replacement Battery for APC Back UPS ES 350 : Health & Household