Question about APC Back-UPS ES 350 - UPS ( external ) - 350 VA - UPS battery lead acid - 6 output connector(s) (NEWITEM13161548) UPS System

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Found an APC UPS 350 in the garbage, seems to work, but I don't understand the difference between having the power button engaged or not because both ways it seems to power my devices.

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You may have a defective switch that is on/off button and is not serviceable.
I suggest you purchase a new APC model and by pass the headache here unless this is a project. You will need to take this unit apart and then call the manufacturer for a new part that may or may not be available or the unit is discontinued.

Posted on Jul 03, 2010

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Posted on Jan 02, 2017

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Not recommended. I asked APC technical support before.

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Does not power on


Please check whether you are getting any power on the UPS or not. In case it is not working even on the AC power, then it might be the transformer inside the UPS which has burned. It can be easily repaired by taking it to any APC service center. This does not seem to be an issue with the battery since the UPS is not even turning on

Apr 29, 2010 | APC Back-UPS ES 350 - UPS ( external ) -...

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After a power outage my apc has this clicking sound. every 4 seconds or so it sounds like it clicks and then a slightly different click 4 seconds later. However, when everything is powered up it doesn't...


I found this on the APC website;
Question: What would cause a Back-UPS Pro, a Back-UPS Pro USB, a Back-UPS RS, a Back-UPS CS, a Back-UPS LS, or A Back-UPS XS to beep once every 5 seconds with no output power?
Answer: One beep every 5 seconds is an indication that the UPS has entered what is called "Low Voltage Sleepmode".
The Back-UPS product has transferred to battery power due to a low voltage condition at the wall. The Back-UPS has remained Onbattery until its runtime was totally exhausted, however, there was still enough voltage present at the wall to trickle charge the battery.

This is considered to be a normal operating state. When the voltage returns to normal the Back-UPS will wake up and restore power to the battery outlets.

Nov 02, 2009 | APC Back-UPS ES 350 - UPS ( external ) -...

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APC Back-UPS ES 350 - when powered on has a blinking green light Is this normal


A blinking green light is likely an indication that the internal battery is nearing the end of its usable life cycle. If it's over 3 years old this is likely the case. To test, plug something in to the battery outlets and pull the plug of the UPS from the wall. If you get a short runtime (or none at all) it's the battery. Batteries are under $20 and can be found here: http://www.batteryinternational.com/apc-backups-es-be350u-ups-battery-ups-batteries-f1.html

Oct 06, 2009 | APC Back-UPS ES 350 - UPS ( external ) -...

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APC external Backup battery is not working plz


It may just need a new battery. The UPS will do a self test on the battery when you turn it on. It may have tried to read the battery and the result came back as "failed". The batteries last about 3-5 years, even less if you live in an area with bad power. The batteries are very easy to change. You can buy replacements at www.batteryinternational.com/apc-backups-es-be350es-ups-battery-ups-batteries-f1.html

Jun 08, 2009 | APC Back-UPS ES 350 - UPS ( external ) -...

1 Answer

APC ES-350 won't turn on; all I see is a blinking light.


Try looking for a small circuit breaker on the side that says "press to reset" - you could have tripped it accidentally when you unplugged the iPod.  Also, try pressing and holding the UPS power switch for 10-15 seconds.  That should force a power on as well.

May 27, 2009 | APC Back-UPS ES 350 - UPS ( external ) -...

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how old is your UPS? It seems that you need to replace the battery.

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If its really a noise? neutral and ground of your utility power (building transformer) should be bonded

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My solution was to unplug everything, hit the reset button, and then power the unit back up. The problem I found to be that I had my laser printer connected to the "surge + battery" side, and for some reason no laser printer can be connected to it.

Sep 28, 2008 | APC Back-UPS ES 350 - UPS ( external ) -...

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