Question about APC Conext 900VA (cnb900) UPS System

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Did my Conext 900AVR die or is it just a battery?

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 took my Conext CNB900 to Batteries Plus and they put in a new battery and checked the unit and found that the new battery solved the problem.

Wilson in Houston

Posted on Jan 23, 2009

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How do I stop the battery from draining after only a few hours.


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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.

Dec 30, 2012 | APC Conext 900VA (cnb900) UPS System

1 Answer

Why does my APC Conext UPS beep after power is restored?


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.

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Replaced conext ups cnb325 battery but power indicator light does not come on.


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.

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My bike has sat for one year. I bought a new battery one year ago and drove it from my old apartment to my current one. The bike has not been started for one year. I got a used gas tank on ebay and...


Ok mate few things to consider here, if the bike has been non started and stationary for a year there is a very good chance that one of the following or all of the following has occurred.
Your battery is dead (they don't like just sitting - doesn't matter new or old, if left for extensive time they will die) Your gear / motor oil would be useless - oil can not just sit in bottom of bike for a year it would be glue
Your carbi would be blocked or partially blocked from fuel gum or varnish in jets
If you like this bike I highly recommend oil and filter change, New spark plug (put about 10 drops of oil down the spark plug hole before you put new spark plug back in to lube the piston) clean air filter (or fit new one) Remove carbi and compressed air clean all jets especially the pilot jet and circuit and stick in a new battery
Once all done for the fist start I would find a nice safe hill and push start it. in my experience under this circumstances if you rely on the electric starter you may find you burn it out trying to start so give at least few minutes running motor to flush everything through before trying to electric start would be your best bet
When you get it going I would dump the oil and oil filter again after 2 hours ride time to confirm all the old expired oil is flushed out - just to be safe
good luck regards Jamie

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1 Answer

Conext 900 AVR. Won't turn on, no lights. Power still out of the surge protected outlets, but no power out of the battery protected outlets. Opened it up, don't see anything damaged, using a meter checked...


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.

Feb 03, 2010 | APC Conext 900VA (cnb900) UPS System

2 Answers

Erratic beeping


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.

Jan 01, 2009 | APC Conext 900VA (cnb900) UPS System

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