BK350 Back-UPS CS Battery Backup System 6 Outlets, 350 VA, 1020 J - Walmart.com
Used APC CS 350 Back-UP 350V Power Supply Battery Backup BK350 No Battery | eBay
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 :
MIGHTY MAX BATTERY 12V 8Ah SLA Replacement Battery for APC Back-Ups CS 350 MAX3943507 - The Home Depot
APC Replacement Battery Cartridge #106 - UPS battery - 1 x battery - lead acid - black - for P/N: BE400-CP, BE400-IT, BE400-KR, BE400-RS, BE400-SP, BE400-UK, BGE90M, BGE90M-CA - Walmart.com
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 :
Amazon.com: APC Back-UPS CS 350(BK350) 12V 7Ah UPS Battery - This is an AJC Brand Replacement : Electronics