Question about Belkin (f6c900-unv) UPS System
Normal 0 Has this happen to anyone else? I've had (3) Belkin F6C900-UNV UPS's burn up after replacing the battery - note: (5) others did not burn up after replacing the batteries. Yes, I'm using the same rated battery 12V's, 8Ah. After replacing the battery (red to red, black to black) and plugging the unit back in, after about 10 minutes I noticed the smell (acid smell) and found that the battery was 'cooking'. The first time this happened, I thought that maybe I had hooked the battery up backwards (as in backwards - red to black, black to red), and certainly that would have burned it up. Since the unit was cooking and I didn’t want to be involved with an explosion or acid burn, I moved it to a safe place to cool and disposed of the unit. But then it happened to me 2 more times, I went back to check that they were connected to the battery correctly (I'm sure I did, but I double checked anyway) and they were hooked up correctly, red to red, black to black. What is going on? Why would replacing the battery cause the system to overcharge the new battery and 'cook' the new battery? The second time I had this problem, the unit was in a remote room and I didn't notice it for about 90 minutes. The system was so burned up after 90 minutes that gel cell acid had liquefied and was started to leak out of the unit, not to mention the acid smell from the 'cooking' that lingered for days. This could be a real hazard. We have 20 of these, and I have lost all confidence in the units. I’m to the point that I feel it necessary to report this to my management as a possible building hazard, and I searching the web to see if others have reported this. (I have 20 years experience in maintaining data systems, and I’ve never run into anything like this before).
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.
Posted on May 07, 2009
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