Don't buy Energizer ER-HM450 UPS

I bought it with a rebate, and it was very cheap, or maybe even free. Of course, it turned out to be a bad UPS. It stopped working as UPS very quickly, couldn't handle a lightest load. Now it turns off immediately when power goes off. I replaced it With TrippLite OMNI PLUS 1000VA. I had one TrippLite OMNI 1000VA for a couple of years, worked just fine so far.