I was given an APC Back-UPS 700, but the internal battery had been removed. I mainly want to use it as a surge-protected power source because my apartment has very few outlets in inconvenient locations. With the unit powered on, it beeps constantly, so I can only use its outlets when it is switched off. I've read that removing or disabling the piezoelectric buzzer might stop the alarm, but I'm not very experienced with electronics. Is there a safe way to handle this, or should I take another approach?
3 Answers
I wouldn’t recommend opening the UPS and removing the buzzer unless you’re comfortable working around electronics. Even when unplugged, the unit can contain charged components, and disabling the alarm could hide a real fault. A basic surge-protected power strip would be safer and simpler if you don’t need battery backup.
The proper fix is to install a replacement 12-volt sealed lead-acid battery, usually around 7–9 Ah depending on the exact model. These batteries are commonly sold for alarm systems and are relatively inexpensive. Match the red and black connectors carefully, and label the installation date so you know when it was replaced. The UPS should then operate normally instead of reporting a missing battery.
Before modifying anything, check the exact model and look for the alarm opening in the case. Some people temporarily cover the sound opening just for testing, but that isn’t a proper repair and may prevent you from hearing important warnings. Replacing the battery or using a standard power strip is the better long-term option.
I understand that replacing the battery is the normal solution. I was mainly hoping to use it as extra surge-protected outlets without spending much, since the battery was already missing.