Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not designed to be serviced

I own two of these units. The units work fine and they are high quality devices (software issues aside).As with any UPS device, the wet-cell batteries wear out. That's usually not a big deal - you can buy replacement batteries (this unit takes two) for about $16. However, this unit is poorly designed and it is difficult to replace the batteries. It's doable, but if you compare the ease of replacement to an equivalent APC unit or OptiUPS unit you won't buy one of these. I also own 2 OptiUPS units and an APC unit and they are very servicable. I would recommend going with either of those.