APC uninterruptible power supply (UPS) can prevent sudden power outages, low light, power supply drops, and surge voltages of computers or other valuable electronic devices. In addition, it can filter out small voltage fluctuations on public circuits; When there is a significant voltage fluctuation, it can also disconnect the mains line internally, isolating your equipment. At this point, your device is powered by its internal battery: until the public lines return to normal.
When powered by batteries, the internal alarm will emit a sound (periodic beep) until the battery is depleted and the APC uninterruptible power supply shuts down or power is restored to “online” operation. Press the on/test button to stop the uninterruptible power supply alarm.
If the public power supply cannot be restored, the uninterruptible power supply will continue to supply power to the equipment until its electrical energy is exhausted. The beep sound will last for 2 minutes before the power of the uninterruptible power supply is exhausted and turned off. At this point, if you are using a computer, you must save the files as soon as possible and turn off the computer before the uninterruptible power supply automatically shuts down. Unless you are using a power outage buffer software that can automatically shut down the computer without manual intervention.
As long as the APC uninterruptible power supply is connected to the utility power supply, it will charge the battery. During the first 4 hours of normal operation, the battery will be fully charged. During the initial charging period, the battery cannot reach its maximum operating capacity.