I have replaced the broken 2 pieces a BELKIN Univ.USV battery 1200VA VAR / USB 670W - there were original indoors only 7.2Ah batteries. Who unscrewing a UPS should really know, however, what he is doing! Immediately disconnect the batteries. Installed at said not erhältlchen Belkin UPS has its own exchange is not provided correspond, was all. But as I said, ultimately everything worked out and the UPS is back.