Continuous beep twice. On/Off power switch does not perform diagnostic tests, but actually turns off the computer which is plugged in. The battery warning icon is not blinking. The online icon is on , I am reading 119-120 volts there are 5 lit bars in the battery charge window and the load capacity window is showing a very low reading.
You have a "Open" battery. The voltage may be good but once a load is placed the computer shuts off. Replace battery
SOURCE: APC Back-UPS ES 500: green light flashes&continuous warning tone
On this unit, the likely culprit is the battery and that it needs to be replaced.
With that, you may want to think about the pros and cons of replacement versus buying an entirely new unit.
This unit is a relatively low end ups and the surge supression uses MOVs that wear out with repeated absorption of energetic spikes. That's why the better (and higher cost) UPSs and surge suppressors don't use them. They're not really that good anyway due to their relatively high transient impedance. The better equipment uses a "transorb" -- basically a back-to-back high voltage zener diode optimized for low breakover impedance and high instantaneous power capability. Unless the transient exceeds the design parameters of the circuit, these do not wear out and do not degrade. That being said, I will assume that you would likely replace this unit with a similar one.
The flashing may not be the battery at all and may be the charging circuitry, thus your new battery may not live very long (half the life that you would expect.
Many batteries out there are refurbs and have issues as all used parts do.
If you contact APC, they will likely give you a 35% discount on purchasing a new product.
The difference in price in the battery replacement vs. ups replacement at this level may only be a few dollars more.
I promise that I am not a UPS salesman, I just deal with many on a daily basis; therefore I am giving my two cents to try to thelp you avoid problems a year from now.
Testimonial: "Outstanding answer with right amount of detail. I swapped battery with identical APC UPS that I have and vfd that battery was cause of warning tone."
SOURCE: APC BR800 Overload light with beeps
Your main control board is defective, you need a new unit.
SOURCE: In My APC UPS, continuous beep sound is coming
Unfortunately that signals an internal fault with the UPS and it requires immediate replacement / repair. Do not continue to use the UPS at all.
SOURCE: What does it mean by the beep sound from the UPS ES 350 unit?
Ok, 3-4 years is a much as you can expect from an ups battery so replacement is indicated. The beeps are letting you know the battery is not able to keep up with demand. So either you have recently added to the system or the battery/s failing.
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