Repairing an Uninterrupted Power Supply (UPS)
Posted: Thu Jan 22, 2015 11:34 pm
I had a Cyberpower UPS unit backing up my main computers in my desk until it recently started acting up. The battery backup outlets quit altogether!
The internal battery was apparently dead so I removed the 5 screws from the back and had a look. The first thing I noticed was how much empty space there was!
After removing the 12 volt battery which was glued to the bottom part, I decided to jump start the unit with my car battery jumper unit.
Since the battery terminals were insulated I used my meter probes to stick into the rolled ends of the female spade lugs and used jumpers to the battery clamps.
The square area above the circuit board can hold a battery 6" Long by 3" High and almost 3" wide if need be. I couldn't find any cheap ones the size of the old one.
I had just purchased a new replacement Cyberpower unit for $41 with shipping so I didn't want to pay $36 for an identical replacement battery either.
I plugged in a 120 volt test lamp to see if it would generate enough voltage while 12 volts was applied instead of the old battery:
After pushing the power button on, the unit beeped 2 long times and then about every minute or so after. The 120 volt night light worked too!
So I ordered a new battery for $15 from Ebay. Length 5.25 inches, Width 2.63 inches, Height 2.44 inches and Weight 3.20 lbs.:
The old battery was only 4 inches Long by 1-7/8 inches wide by 2.5 inches high. Weight was about 2.5 pounds.
The original Cyberpower 425 VA unit cost me $25 on Black Friday about 4 years ago. I can't figure out why the battery backup outlets would not
keep working if there was 120 volts going into the unit! The battery should only affect performance when there is no electrical power...
The internal battery was apparently dead so I removed the 5 screws from the back and had a look. The first thing I noticed was how much empty space there was!
After removing the 12 volt battery which was glued to the bottom part, I decided to jump start the unit with my car battery jumper unit.
Since the battery terminals were insulated I used my meter probes to stick into the rolled ends of the female spade lugs and used jumpers to the battery clamps.
The square area above the circuit board can hold a battery 6" Long by 3" High and almost 3" wide if need be. I couldn't find any cheap ones the size of the old one.
I had just purchased a new replacement Cyberpower unit for $41 with shipping so I didn't want to pay $36 for an identical replacement battery either.
I plugged in a 120 volt test lamp to see if it would generate enough voltage while 12 volts was applied instead of the old battery:
After pushing the power button on, the unit beeped 2 long times and then about every minute or so after. The 120 volt night light worked too!
So I ordered a new battery for $15 from Ebay. Length 5.25 inches, Width 2.63 inches, Height 2.44 inches and Weight 3.20 lbs.:
The old battery was only 4 inches Long by 1-7/8 inches wide by 2.5 inches high. Weight was about 2.5 pounds.
The original Cyberpower 425 VA unit cost me $25 on Black Friday about 4 years ago. I can't figure out why the battery backup outlets would not
keep working if there was 120 volts going into the unit! The battery should only affect performance when there is no electrical power...