Why this happens: There are 2 reasons why your UPS backup battery fails to charge. The first reason is that the battery is old and worn out. UPS batteries typically last between 3-5 years. As they age, their ability to charge and store electricity gradually reduces. That will result in a lack of output from the battery during a power outage.
Your APC battery backup won’t charge if there’s no incoming power supply. Besides that, a loose battery connector plug, wiring problems, or a blown fuse will also prevent it from charging. Lastly, old batteries will also fail to charge at the end of their service life. Troubleshooting your APC battery backup is pretty straightforward.
What’s happening: Your UPS should not discharge any power from its internal battery. At the same time, the unit is plugged into a working wall socket. However, suppose you find the battery draining even when it shouldn’t. In that case, there’s a problem with the incoming power supply.
A common issue with UPS systems is that they fail to switch to battery power when there is a power outage. This issue is usually caused by a malfunction in the UPS’s internal components or a dead battery. Check if the battery is connected properly and functioning. If the battery is defective, replace it.
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No Incoming Power SupplyLoose Battery Connector PlugInternal Wiring FaultsBlown Or Burnt FuseEnd of Service LifeWhat it is: All APC battery backups have a limited lifespan, typically between 3 and 5 years. Some batteries might last longer, though the ones discharged and recharged often will wear out sooner. How it failed:The final reason your APC battery backup isn’t charging is that the unit has reached the end of its service life. As the backup battery age...See more on howtofixit iFixit
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