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APC UPS Battery Replacement for APC Back-UPS Models BE500R, BE550MC, BK300C, BK350, BK500, BK500BLK, BK500M, BK500MC, BK500MUS, and SC420, SU420NET (RBC2) - Newegg.com
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12v 8Ah APC Back-UPS CS 500, BK500, BK500BLK UPS Replacement Battery (2 PACK) SPS BRAND - Newegg.com
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