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Amazon.com: APC Bk500 Bk500 Back-Ups Cs Battery Backup System, 6 Outlets, 500 Va, 480 J : Electronics
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APC UPS Battery Replacement, RBC2, for APC Back-UPS Models BE500R, BK300C, BK350, BK500, BK500BLK, BK500M, BK500MC, BK500MUS, and SC420, SU420NET black - Walmart.com
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