One of the most common enquiries our PowerShield Support Team get relates to Defender and SafeGuard UPSs that are making a loud BEEP noise for no apparent reason. If your Defender or SafeGuard UPS starts making a beeping noise the most likely reason is that you need to install a new battery. How long a battery in a UPS lasts depends on many factors, like the environment you are running it in and the load you are connecting to it. You can replace your battery easily and here are some videos that