OPTI-UPS ES1500C-RM 12V 9Ah UPS Battery - This is an AJC Brand Replacement This is an AJC Brand&#174; Replacement for a OPTI-UPS ES1500C-RM 12V 9Ah UPS Battery Voltage: 12V (12 Volts) Capacity: 9Ah Terminals: F2 Number of Batteries Required for a Full Replacement 2