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Replaced the 2 batteries. The instructions were OK but not as good as APC. Suggest take a few pictures as you disassemble the unit so the reassemble goes smoothly. “I had reinstalled the mounting bracket incorrectly at first and the front panel wouldn’t secure correctly.” We have yet to know if the batteries life or worth the price.
if i were you id stick with amazon's rb1290 they are 66 dollars. i bought this one thinking im paying more but it comes with a shipping label like the other reviews said. it DOES NOT. so i pretty much paid extra for nothing.