I don't know how long this battery will last but it worked to get my UPS back up and running. The connections from my UPS unit and the battery were not an exact match - the battery terminals were smaller than the battery I removed even though Amazon said this battery was the replacement. Luckily, the connectors in the UPS housing still worked as they had two different areas on the connector for the old and the new battery.The battery matched the one that I was replacing. I put it in the UPS and it works.I had a very old Black & Decker string trimmer that was down to about 5 minutes on a full charge. I opened it and did a search for the batter that was inside. This fit the specs and with spade plugs was easily replaced. So far it's working just fine. It was pretty cheap so I'm not sure of the longevity. I decided to spend $20 and take a chance.It has the small spade lugs and the APC UPS uses the large lugs. However, the lugs pushed on ok.I have an APC 350 UPS on my router, which takes this battery. Moved it from somewhere else several years ago. Can't recall how long ago I put a battery in it. Must be at least 8 yrs ago. Finally quit and opening it up I found a PowerSonic just like this one, tho made in Vietnam, not China. Must have bought it from local electronics supply long out of business. Notice they sell PowerSonic at Allied Radio, too. Must be a reason :)Good product, easy to installGood replacement for CR123 battery.Perfect fit for my APC ES-350G. I noticed that several of the replacement batteries had reviews complaining of the wrong size connectors. These fit nicely and made a firm connection. Product was delivered on time with good packaging.