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An uninterruptible power supply, also uninterruptible power source, UPS or battery/flywheel backup, is an electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails.

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Ups is dead, no singals

Before one year when i was turning on the ups alarm was beep-ing for long time, not battery alarm but caution alarm. Now I tried to open it , battery is completely dead (0 Volt). Also ups doesnt give any singal all led/alarm/light are off even power button. So does it worth to buy new battery or UPS is dead? How to know what is wrong ? Battery cost half money of UPS

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Fuse are ok i think

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If the battery lasted for less than a year it is still under warranty and I would return it. I have three and replace the batteries about every three to four years. None are less than ten years old.

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UPS is 5 year old

As i see on manual

Before one year : Red ON and beep keep alarm. Potential internal failure. Restart UPS. If red LED

still light, call for assistance.

Now : All dead

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Dimitris Piralis さん、ありがとうございました!
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