Question about CyberPower OfficePower 650SL UPS System

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'Battery' outlet dead.

Office equipment plugged into 'battery' outlets were dead this morning and UPS would reset only briefly. All devices worked when plugged into 'surge' side or unprotected wall outlet. Clocks in area were not flashing as usual after power outage. Now, at end of day, unit resets as if no problem.

Does this indicate a problem with the batteries? Unit is approx. 8-10 years old. Can batteries be replaced/serviced or is it cheaper just to buy a new UPS? Could it be that an otherwise unnoticed outage exhausted the batteries which recharged during the day (as in...functioning normally)? Then, why no flashing clocks? Thanks for your input. --Lynn--

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These CPS650SL's are at that age where they need a new battery. You can find these at:

It's usually less expensive to get a new battery instead of replacing the whole unit. It only takes a moment and keeps it out of the garbage.

Posted on Oct 22, 2009

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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 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 (BP7.5-12 battery).
You could compare the cost of a new battery to the cost of a new unit.
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

Posted on Nov 18, 2008

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Hi There, Its definately the battery. The batteries can be replaced.

Posted on Nov 05, 2008

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1 Answer

Tripp-lite Internet Office UPI 350U series has red light flashing by "Overload/Check Battery." What should I do. Thanks

The power rating of the equipment that is plugged into the battery-supported outlets must not exceed the UPS capacity. To make sure it doesn't, add together the power rating for each piece of equipment and compare the total requirements to the capacity of the unit, which is listed a) on the bottom of the UPS, or b) on the Specification tab on Tripp Lite's product page. If the total power draw of the connected equipment exceeds the capacity of the UPS, the load MUST be reduced for the UPS to perform properly.

If this is NOT the case, disconnect the unit from the wall outlet and check the battery voltage- it may be at its end-of-life cycle. It may not be holding the charge or not take a charge anymore.

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You know they have a TWO YEAR Warranty ?

Sounds to me that it is faulty (one of the relays or switches is not providing 'through' power to the supposed 'backup' socket when the AC power is on.).

Have you followed the manual ?
available here

Have you done a 'self test' ?
'To Run a Self-Test: With your UPS plugged in and turned on, press and hold the MUTE/TEST button for two seconds. Continue holding the button until the alarm beeps several times and the UPS performs a self-test. See "Results of a Self-Test" below.
Note: You can leave connected equipment on during a self-test.' see manual

If the LCD does not give you the answer then it is faulty. Seems like something went faulty on restarting your UPS in the morning.

Seems like plenty of help available from this companys' website.

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The UPS in this office is out of order, message that appear on screen is 'UPS V OUT LIMITS' and 'Battery critical'

follow this steps and fix it. God bless you
Plug the battery backup into a working electrical outlet. If the battery backup turns on when the power button is pressed, then the problem may be that the previous electrical outlet is faulty. Proceed to step three. If the battery backup doesn't turn on, proceed to step two.
  • 2 Reset the circuit breaker on the battery backup. APC battery backups have a labeled circuit breaker button located on the unit near the phone line, fax line, USB, network and coaxial cable inputs. Press the button to reset the circuit breaker. Power on the battery backup by pressing the power button. If the battery backup powers on, proceed to step three. If the battery backup doesn't turn on, proceed to step six.

  • Read more:
  • 3 Determine if the battery backup is charged and providing battery power. With the battery backup on and plugged into a working electrical outlet, plug a computer monitor into one of the battery backup outlets labeled "battery backup plus surge protection" on the battery backup. (APC power supplies have some outlets that provide only surge protection while the other outlets provide surge protection plus battery backup.) Turn the monitor on. Unplug the battery backup power cord from the wall outlet. If the monitor remains on, the battery is holding a charge, supplying electrical power and the battery backup is working properly. If the monitor goes off, proceed to step four.
  • 4 Charge the battery. Plug the battery backup into an electrical outlet and allow the battery to charge for 16 hours. This will fully charge the battery.
  • 5 Test battery charge. Once the battery is fully charged, repeat step three. If the monitor stays on when power is interrupted to the battery backup, the issue is solved and the problem resulted from an incompletely charged battery. If the monitor turns off when power is interrupted, the battery within the battery backup is faulty and needs to be replaced.
  • 6 Replace the battery backup unit. The unit itself is faulty. If the battery backup is under warranty, contact APC to request a replacement.
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    “OVERLOAD/CHECK BATTERY” LED: this red LED lights continuously after a self-test to
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