I have an APC XS 1500VA unit that just finally failed on me (batteries crapping out). It's been quite useful, but power here has been less-than-good, mostly due to me tripping out a breaker roughly ...
I have a (refurbished) APC Back-UPS LS 500 I've been using for a year and a half or so, and recently when the power's been crappy (thanks to bad drivers...) I've noticed it's no longer doing the thing ...
When carried out correctly, the replacement of UPS batteries is a safe and effective procedure. There are, however, significant risks associated with UPS battery replacement of which it is important ...