Question about CyberPower 725SL UPS System

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I have a CyberPower 725SL UPS. Shortly after turning it on, it will beep as if AC power was lost and the green light goes out. I checked the battery and it's good. I'm assuming something went bad with the circuitry, but not sure where to start.

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  • 35 Answers

Couple different items to check.

  • Try letting the unit set ideal for overnight charging the battery. Do not even turn the unit on.
  • Replace the battery.
If you turn the unit on when the battery is plugged in and does not keep a charge you can almost be sure it is the battery or the charging circuit not maintaining the battery.

Posted on Nov 11, 2010

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Posted on Jan 02, 2017

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Unit beeps occasionally


It beeps whenever there is a transient interruption in the incoming AC power.
So, the UPS is protecting your equipment from those pulses, as it should be doing.

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One side of my Cyberpower 525SL stopped working. When i press the red button the green light comes on, but goes off quickly accompanied by a beeping. The TV, dish, and vcr/dvd continues to work. Help...


Hi droger68,

The reason for the issue that you have right now with your Cyberpower 525SL is a bad battery. This means that some of the battery relay's component or relay has failed. You may contact the manufacturer if it's still under warranty. If not you may check this site they do have battery for your machine.

Hope this helps.

Thank you for using FixYa.

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Battery side of UPS beeps on and off when turn on.


How old are your batteries? If they are over 3 years old it may be telling you that its time to get new batteries. You can check these using a voltmeter too to help determine if the batteries are the problem. You can find replacements at http://www.batteryinternational.com/ups-batteries.html

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My UPS Cyberpower 725SL is blinking and clicking on and off


When the battery is low, or dead, on these it will act this way. You may want to try a new battery. Here's a supplier: http://www.batteryinternational.com/cyber-power-cps725sl-ups-battery-ups-batteries-f1.html

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Battery replacement


The batteries are very easy to replace on this model. You can simply remove 6 phillip head screws in the bottom and the unit will come apart to reveal the battery. Simple fast-on connectors. Here's a link to a new battery for that model: http://www.batteryinternational.com/cyber-power-cps725sl-ups-battery-ups-batteries-f1.html

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Cyberpower 725SL Intelligent Back Up Power: This unit now just flashes on / off. When I press the red button and then back on again - it continues to flash on / off. I have tried plugging it into other...


It would appear that you need to replace the battery on this unit.
You could get a new battery from a local battery specialty store like Batteries Plus or Interstate Battery, or online at www.replacementupsbattery.com. A new battery would be about $30. If you took your old battery there, they could recycle your old one, as well as match it up with the correct one you would need (BP9-12 battery).
We have a 3 year warranty on all our battery back up units. If you have any questions, you could contact us here at CyberPower Systems Technical Support at 877-297-6937, M-F 8-5 Central, or email us at tech@cyberpowersystems.com.

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Cbyer power 525Sl keeps turning off and on and beeps.


I have the exact same issue with my 525SL.
When you push in the red button - the green power light comes on for about 5 seconds = then the light goes out and the device plays a single long beep for about 5-8 seconds.

Given the dialogue here - I took out the battery and bough a brand new BB replacement battery and returned it into the unit as it should. The device continues to have the same behavior.

So it is NOT always a new battery that will fix the system.
Don't jump into spending $30.00 for a replacement.
Look into this further or you'll wind up wasting your money.



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My computer won't boot and the CyberPower 825 AVR makes a continuous sound.


It sounds as though the UPS is not receiving power. Check that it's cable is properly plugged into the wall. Also verify that it's internal ground fault interrupter has not tripped, it's usually a little red button on the back of the unit, it should be pressed in and should stay that way, if it pops out then there is a problem with the ground of your electrical outlet. Also check that the breaker for that electrical has not tripped at your fuse box.

Since the UPS is not receiving power the batteries have discharged and that is why your computer cannot start, there is not enough juice from the UPS to boot it. That is also why it is making a noise as most UPS's sound an alarm to indicate that they are not connected to power.

There is a chance that the batteries in your UPS have gone bad or that something has become faulty in your UPS. Try plugging your computer and monitor directly to the wall bypassing the UPS to see if they work fine.

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Cyberpower 725sl


Yes, it would appear that you need to replace the battery on this unit.
You could get a new battery from a local battery specialty store like Batteries Plus or Interstate Battery, or online at www.replacementupsbattery.com. A new battery would be about $30. If you took your old battery there, they could recycle your old one, as well as match it up with the correct one you would need (BP9-12 battery).
We have a 3 year warranty on all our battery back up units. If you have any questions, you could contact us here at CyberPower Systems Technical Support at 877-297-6937, M-F 8-5 Central, or email us at tech@cyberpowersystems.com.

Mar 15, 2008 | CyberPower 725SL UPS System

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