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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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APC Back-UPS Pro 1500VA 10-Outlet/2-USB Battery Back-Up and Surge Protector Black BN1500M2 - Best Buy
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Amazon.com: Apc, Replacement Battery Cartridge #110 Ups Battery 1 X Lead Acid For Back-Ups Es 550, 600, Back-Ups Pro 550, Back-Ups Rs 650 "Product Category: Ups/Power Devices/Batteries (Ups)" : Electronics
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