I have a Belkin F6H500frUNV UPS. It's about 10 month old and now the unit didn't charge the Battery anymore. Battery level falls and falls every day, even if nothing is connected on it.
For this night I take the Battery out and charge it with the charge unit of my bike. Now the battery level is at 70% but still going down (nothing connected, UPS on AC power). So it seems that the unit doesnt deliver any power to charge the Battery.
What is it possible to do?
I know it is still on guarantee but unfortunately I can't found the Invoice
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The symptom can occur if the load is too large. It will also happen when the unit reaches a certain age.
I've found that the low-end consumer UPS's should be replaced when the battery fails. The charging circuitry usually fails to charge the battery even with a new battery soon after the replacement.
The way I check if the battery or the UPS charging system has failed is with a voltmeter to give the current voltage and a variable DC power supply (whatever is appropriate for the battery) to attempt to charge the battery. I can watch the battery discharge with an oscilliscope if I want a full trace of the unit.) Charge the battery fully then watch the unit over time. If the battery itself is bad, you won't get the full charge or it will discharge as soon as it is removed from the power supply.
I hope this helps.
Cindy Wells (the server UPS's tend to be a better choice if you want to replace the battery and keep the UPS.)
If your UPS is not holding Charges, this means that the Battery does
not carry the load when AC fails. Check to see that the batteries are
okay by testing the individual batteries on load using a potentiometer
load with multimeter. If the battery voltage drops below 10V replace
the batteries and your UPS be okay
If the battery backup unit is over 2.5 years old then you will need to replace the battery. Go to your local electronics parts house or battery distributor. They will have the gel cell battery you need in stock. These units are just like small car batteries, after a few years of use they will break down and not hold a full charge. When this starts to happen the battery life is about to be over, it will hold less and less charge until one day no power at all and then the UPS will not power on. The UPS have a monitor circuit that will prevent them from powering up with a dead or missing battery. The replacement battery should run less than $20.
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I just replaced the batteries on my Belkin F6C900-UNV. They died just short of 3 years of use, which is what I would expect. My unit contained two 12 volt, 4.5 amp-hour batteries that were connected in series. When connected in SERIES (one battery's red terminal is connected to the other battery's black terminal), the two batteries behave as if they were one 24 volt battery. Therefore, this UPS is designed to charge a 24 volt battery. When replacing the batteries, you cannot use a single 12 volt battery. This will fry the battery. You can use either two 12 volt batteries connected in series, or one 24 volt battery.
I measured the charging voltage of my two new batteries (connected in SERIES), and find it charging at 24.6 volts. This is an ideal float voltage to maintain these sealed AGM (absorbed glass mat) lead acid batteries (13.2 volts per battery). The replacement batteries are similar to the originals, each measuring about 2.7x3.5 inches and 4 inches high and rated at 12 volts, 5 amp-hours. They can be purchased for $20 or less each, so for $40 I now have a fully functional UPS, good for another 3 years.
If you've got nothing my guess is its something more than the battery as it should still be able to draw power if its plugged in. If its within the warranty period (3 yrs, I believe). Go to the belkin webpage and to their ups support and start the process to return it and get it fixed/replaced. A couple months ago I had a F6C500-UNV that suddenly died on me just like yours - no nothing. It cost me $13.00 or so bucks to ship the broken unit to Belkin; a week or two later I got a brand spankin' new F6C550 or whatever they currently sell in that same voltage area back from them. The cost to RMA the broken unit was much cheaper than even buying a new battery for the old and now discontinued unit.