APC Back-UPS BK280 UPS Double check the actual size of the batteries being replaced. UPS replacement battery packs contain replacement batteries only. You must reuse your existing cabling and hardware. APC model numbers are very similar, so check the model number listed here with the barcode label on the back or bottom of your unit. Please double check your APC model numbers. There are many APC units that have similar model numbers, but require different types of batteries. HC1221W Battery . . . HC1221W Battery (12V, 5.1AH) 4.4 12 5.1 5.5 1.89 4.02 1 Year SLA CSB No http://site.apexbattery.com/logos/apc.jpg New C1 U

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