This unit is a few years old, and I'm certain that it's time for a new battery. Up until a couple of weeks ago, it would beep and I was guessing that it was telling me something... maybe the battery was going? But all the plugs were active and live. Now, the backed up plugs are all dead but the other three are live. I tried getting some advice from Conext, but they never answered my question about whether a new battery would resolve the problem. They told me that it was out of warranty and perhaps I should replace the whole unit. I checked the inside fuse and it's not burned out, but I don't know what else I can check to determine whether it's a throwaway, it can be repaired (by who in New England?), or if its just a battery issue?
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I have one question, have you connect the battery terminal correctly the first time you install your new batteries? If not, it might be your battery fuse is blown during the process :) check your UPS battery fuse.
After about 2 to 3 years the batteries usually have to be replaced. I found with our UPS's we get about 3 years maximum from the batteries. Ordering the originals from APC is rather expensive.
Locate a professional battery distributor in your area. Get the part numbers written on the batteries in your UPS, and including the detailed descriptions. You can then order these from the distributor. APC uses industry standard batteries. We found the Panasonic and Portilac brands to be excellent.
APC manufactures the UPS's. They use various battery manufactures depending on bid costing.
There is a solder problem on some units. Remove the battery and the 4 screws, tilt the lower panel away, and let the circuit board drop out onto the workbench. WATCH FOR THE TRANSFORMER, it is not fastened. Inspect for a loose solder connection, and if you find it, re-flow the solder. Re-assemble and plug into the AC current to charge the battery.
inside your unit there are 2 power boards that convert a lot of current to and from the battery - complete failure on one of theses boards is a common problem and it's a terminal one. if the mains power board has failed then yes, it has indeed overstressed the wall plug and you will have to completely replace it as soon as possible.
I had the same model/symptoms (no lights on the front panel). I had a compatible, though smaller, battery from a Verizon Fios backup unit, and I tried that in the UPS--it worked. That confirmed that I just needed a new battery.
It is likely the battery. These batteries are designed to last 3-6 years in a UPS. The good news is that if it is the battery, it is completely user replaceable and you'll have a Cyber Power unit that works just like new with a new battery. What may have happened is that the battery was weak, and you may have had a slight dip in the AC power. This caused the Cyberpower unit to switch over to the weak battery which couldn't handle the load. The unit then turned off. When you press the "ON" button, the unit will go through a self-test that checks all of the components and the unit will not turn on and be functional unless all of the components come back with a PASS, including the battery. If possible, test the battery with a voltmeter, it should read around 13.5, but not lower than 11.5v DC. However, with the unit over 3 years old, it almost certainly the battery. Here's a link to a replacement battery for the CP685AVR: http://www.batteryinternational.com/cyber-power-cp685avr-ups-battery-ups-batteries-f1.html
This is a signal that the battery is dying, and is failing the self-test. According to Conext, the battery replacement alarm goes off for one minute every five hours. You should also see the replace battery light on the front of the unit lit. Changing the battery should solve your problem.
Most if not all units come with a one year warranty. If you bought yours used check the serial number with APC to see if your unit is under warranty. If it is they will send you a new or refurbished one. They have decent customer service and ship pretty fast. Is that warning noise illuminating the replace battery led? If so you may need a new battery especially if it is over a couple of years old. It is cheaper in most cases to get a higher capacity third party battery and replace it yourself then to buy a new ups. Unless yours is not functioning properly or you need a higher capacity unit. Just recycle the batteries and sell the unit if you upgrade.