Opti-UPS Enhanced Series ES1000C, ES1000C-RM 12V 8Ah UPS Battery - This is an AJC Brand Replacement This is an AJC Brand&#174; Replacement for a OPTI-UPS Enhanced Series ES1000C 12V 8Ah UPS Battery Voltage: 12V (12 Volts) Capacity: 8Ah Terminals: F2 Number of Batteries Required for a Full Replacement 2