Best Power Fortress 1422 BTG-0303 12V 7.5Ah Battery - 4 Pack
Fortress 1422 replacement battery (rechargeable, high rate)
Amazon.com: Power Sonic 12V 7Ah UPS Battery for Best Technologies Fortress 1422-4 Pack : Automotive
Compatible Best Technologies Fortress 1422 Battery - Replacement UB1280 Universal Sealed Lead Acid Battery (12V, 8Ah, 8000mAh, F1 Terminal, AGM, SLA) - Includes TWO F1 to F2 Terminal Adapters - Walmart.com