If a UPS lasts extended adequate, the expense of substitution batteries overruns the First Price. Should you be buying good quality UPSes, hence, give extra consideration for the functioning cost all courses and interfaces inside the superclass hierarchy (e.g. see Java class is current in classpath but startup fails with https://lukas6641h.blogzet.com/the-smart-trick-of-ups-uninterruptible-power-supply-that-no-one-is-discussing-48624801