Need help: Can a Eaton UPS fails due to an old defective battery keep charging

[Happy Hopping]

So this guy has a Eaton UPS, the battery has been blinking "Replace" for easily 9 months. He won't do anything.

Eventually, he finally replaced it with a new battery, but as soon as the new battery is connected, the whole UPS dies. Has anyone of you seen this before? And what is the cause?

 

[Brian_B]

I had an old Ford Ranger once. The brakes were going out for about 9 months.

Finally I fixed the brakes. The radio went out right after that.

Don't think it's necessarily related. Do make sure it was plugged in correctly (reversing polarity on the battery is a surefire way to kill something)

 

[Happy Hopping]

the battery is labelled clearly red / black. the wiring is correct

 

[Happy Hopping]

I found this. What do you guys think? (1st link on the google search engine)

https://community.spiceworks.com/topic/693473-tripplite-ups-failed-due-to-bad-battery-what

 

[Happy Hopping]

I would like to re-visit this scenario:

I found 2 links:

https://www.carcitymotors.com/what-happens-when-you-overcharge-a-car-battery/

https://www.sealedperformance.com.a...ult of too,battery will progressively heat up.

now, if a UPS battery is dead, and you keep charging it, you are over charging in a matter of speaking.

and someone in the industry told me:

The battery charger inside the UPS is built so the lower the voltage is on a battery, the more power it applies to the charging circuit (this is very common sense). However, when the voltage of the battery is too low (a total dead battery), the charger wants to send so much power to the battery that it would destroy itself

the charger circuit is on its last leg, as it was trying to charge a dead battery for months, it remains as open circuit after the old defective battery was removed. As such, once a health battery is installed, the circuit becomes closed, and a dying charger circuit simply can't handle the demand to charge a healthy battery, and as it tries (for the last time), it dies. Since that charger circuit is part of the UPS, the UPS dies.

can anyone confirms the above theory?