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 not charging the battery

My ups is not charging. The problem is not of battery, what else should I check in the circuit.

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which model is your UPS?

Had you removed the battery and test with a multimeter?

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These things usually have two batteries and usually one will fail before the other. Look at the diagnostics lights on it and tell us what you see.

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If the UPS is not charging the battery,They should check the battery connection,Integrity of the battery and Battery charger. Saheed Adeosun

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I have the same issue. CyberPower replaced my battery because I thought that was initially the problem. The replacement battery came charged, but ran down and isn't charging. It seems like the unit itself isn't charging the batteries.

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GS1500U 1. Bought 2 new batteries 2. The new batteries discharged to 0% 3. Reveived 2 more new batteries with 93% charge leaving the store 4. Hot home plugged it in to see if it would charge 5. It began to discharge from 93% to 84% 6. I let it run plugged into the wall with nothing plugged into it. 7. Awoke this morning to a 16% charge 8. That is a discharge from 93% to 16% in less than 24 hours with nothing plugged INTO the GS1500U. Any advice is appreciated to fix this.

Thank You

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Did you find a fix for this as I am having that same problem?

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@danielaleburgess have you chek the voltage battery ? let me show you how to chek

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Yes, battery showing 50v. Checked the charging voltage and it was only 34v??

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at power on position / standby dislodged the negativ/black cable and if the ups its dead you must replace the battery regulator Sir at ups ica usually use lm317 , what type ups with 50v battery ?

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Dhrubajyoti Saikia will be eternally grateful.
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