Question about Opti -UPS BackUp-Time 525BT (UPS-525BT) UPS System

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I'm in trouble... blew my UPS :(

Hi agentsmith, A couple years ago, I swapped the original (7A2) battery for a car battery and had to be careful, because I measured some 90V or so, between the housing and battery terminals. It all went good until the day I accidentally misplaced the setting on my multimeter; instead of the voltage measuring setting, I had it on Amp setting. Result: It shorted the circuit, the house fuses went off and now my 525bt only works via battery supply, running only about 5 minutes after switching on the main switch of the unit. The 5 fuses of the unit are all O.K.; nothing looks burned. I'm a fourty year experienced hobby electronics fan and would need a circuit schematic to find and repair the damage. In the worst case I thought of powering the unit via two 13V/4Amp transformers in (parallel phase)via a bridge rectifier, a 60oooMF/16V electrolytic capacitor and an automotive relay, switching over to battery PS in case power failure. The only problem I then would have is: how to get rid of that timed 5 minutes automatic turn off cycle??? It must be in that IC or is there a timing cap responsible for it? What to do? I would greatly appreciate some advice on that. Maybe I'm able to reward you for your good advice with offering you some joy with my musical twitter-talent? ( ) I'm a retired (66) living in Chile and we got lots of power problems... My email:

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Re: I'm in trouble... blew my UPS :(

You are complicating your power problem. It looks like a surgeon that gets a cold, gets involved in his medical knowledge and decides to implant himself a heatr rate monitor. If you have a serious power problem in Chile, your best bet is to buy a UPS with enough capacity to handle the load for extensive periods of time. American Power Protection has a very good configuration tool on its website (

Posted on Sep 21, 2007

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Power keeps going on and off

I have the same problem.
It is most likely the battery.
I tested my battery on a Shumacher trickle charger, and the battery wouldn't hold a charge.
This is a common problem with UPS systems that use sealed lead acid batteries.
The longest life that you can expect with these types of batteries is 5 years MAX.
The battery can be replaced with a Radio Shack 12V/7200mAh Lead-Acid Battery
Model: CNB-GP1270F2 | Catalog #: 23-9030
Here is the link for the UPS users manual.
To replace battery, (unplug AC cord), turn the UPS upside down on floor or workbench.
Remove the 6 deeply recessed phillips screws, then pull the bottom off.
Remove the wire leads from the old battery (pull on the connectors, not the wires). Install new battery (red wire to red or + sign) and replace the bottom and screws. Careful, tighten the screws finger tight (plastic strips easily).
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All UPS uses some sort of battery to power the unit in the event of a power outage. Like car batteries they also have a life span which can be a couple of months to a year or so. If the UPS has been in service for some time, perhaps it simply needs a replacement battery. On the other hand, if the unit is fairly new and carries warranty, it may be to your advantage to consult your dealer and claim for a replacement.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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The answer is yes, until you have a blackout. oops.

You have something..... so

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Call me 727-823-6100
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