features: ajc brand replacement compatible with a csb hr1251wf2 ups battery voltage: 12 (12 volts) capacity: 12ah terminals: f2 chemistry: sealed lead acid (agm) ajc brand replacement batteries length: 6 inches width: 3.91 inches height: 3.8 inches mportant:&nbspyou&nbspmust re-use:&nbspyour existing cabling and hardware. These are&nbspreplacement batteries&nbsponly. note:&nbspit is your responsibility to verify the batteries being ordered match the batteries in your unit&nbspprior to placing your order. We are not responsible for incorrect orders. disclaimer:our products are not affiliated with or authorized by csb.