iFixit - Answers With Device "UPS"

APC UPS: How to replace the BX series back UPS battery

Sun, 22 Mar 2026 04:43:07 -0700

what battery should i use

⟐ Commented March 22, 2026 at 4:43 MST

UPS: How long does a UPS supply power

Wed, 25 Feb 2026 14:07:18 -0700

Hello, I recently got an Infosec E4 LCD LT UPS, unfortunately the two batteries that came with it were dead, so I replaced them with new ones same capacity and voltage (12v & 7Ah), then I downloaded the software to tweak and monitor the UPS, the temperature is normal 18°C, the output power is 220v 0.5A at 50Hz, which only 12% of the load capability of the UPS.

The batteries take a very long time to get to 100% but when I remove the plug from the outlet to test the UPS then it can only supply power for a maximum of 5mins .

If I’m not mistaken, the batteries voltage is 24v and their capacity should be 3.5Ah since they are in serie, which means 84Wh and I’m consuming 110W (assuming the load as DC current), so it should last at least 45mins.

I didn’t find any approximations in the internet to have an idea on how much time a UPS should take so I hope I don’t have bad batteries, but if so then the fault alarm must be triggered, like when I test it the first time with the dead batteries.

⟐ Commented February 25, 2026 at 14:07 MST

APC Back-UPS Pro: Failed to charge the battery

Sun, 18 Jan 2026 01:10:18 -0700

The device failed the charge the battery.At first there was power after I turned it on after the backup time alapsed the device is unable to turn on again

⟐ Answered January 18, 2026 at 1:10 MST

APC Smart-UPS: Repair or source a UPS transformer?

Sat, 13 Dec 2025 21:08:49 -0700

I have a SUA1500RMI2U, with a cooked transformer.

Replacement is difficult as the exact model of the transformer seems hard to find, due to age. Replacements I do find also seem fairly expensive.

I’ve heard of transformers with inline fuses, and I’m hoping I can repair this one.

Does anyone have any recommendations on where to start checking if there’s an easy fix or better yet, if there’s a drop in equivalent replacement?

⟐ Answered December 13, 2025 at 21:08 MST

UPS APC RS 1000: ups not on online mode

Tue, 23 Sep 2025 09:36:39 -0700

after replacing new battery ups not on online mode

⟐ Commented September 23, 2025 at 9:36 MST

UPS: My PC's UPS ZEB-U725 gets off while running

Mon, 22 Sep 2025 03:22:14 -0700

Why My PC's UPS ZEB-U725 gets off while running

⟐ Marked as duplicate September 22, 2025 at 3:22 MST

UPS: My PC's ups gets off while running

Mon, 22 Sep 2025 03:22:14 -0700

Why my PC's ups turns off while running?

⟐ Marked as duplicate September 22, 2025 at 3:22 MST

UPS: Issue UPS even OFF

Sat, 23 Aug 2025 00:13:46 -0700

Hello everyone, I come to you because my UPS is flawed. Indeed, my UPS makes a noise like clicking even when off. It looks like the clicking noise when the UPS start itself after power off. Except this time, it does it even without being ON. And, when I decide to put ON, it definitely put itself on work condition whatever there is power or not. The situation is that it can't load itself when network works. It can even stop my computer as it is always with empty battery. I have opened it but nothing abnormal at first view. What to do? Thanks

WE Nova 1000VA

⟐ Edited by author August 23, 2025 at 0:13 MST

UPS APC RS 1000: Overload alarm lights and sound

Sat, 26 Jul 2025 08:04:58 -0700

My ups, after 5 years of continuous operation shows the overload's light .

I unplugged the PC and I replaced the battery but I have not solved the problem.

Then I opened it to see if there are components that are burned or leak but nothing.

To be sure I replaced the cooling fan but nothing has changed.

Can anyone give me some tips?

Thank you very much.

⟐ Commented July 26, 2025 at 8:04 MST

UPS: Ups not charging the battery

Fri, 25 Apr 2025 17:14:37 -0700

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

⟐ Commented April 25, 2025 at 17:14 MST

CyberPower 1000PFCLCD UPS: kenpa sleep mode pada komputer ketika dinyalahkan

Mon, 10 Feb 2025 08:30:05 -0700

kenapa slleep mode pada komputer ketika mulai start

UPS: Why isn't my UPS turning on?

Wed, 04 Dec 2024 02:37:59 -0700

I have a Powercom BNT V1.3 UPS, which I got from my uncle. It's a line-interactive model and decades old. Other than its obviously dead battery, it was working fine when I first received it.

Since the battery was dry, I attempted to revive it by adding water to the cells. Afterward:

I reconnected the battery.
I turned the UPS on to start charging the battery.

Unfortunately, after charging for a while, I heard a pop and saw a flash of light. I immediately turned the UPS off and noticed the smell of "magic smoke" from one of the components.

I later found out the battery had an internal short. Since then, the UPS hasn’t started.

Tested the transformer for continuity: it seems fine.
Fixed two broken traces on the back of the circuit board (see images below).

I am unable to identify which component might have failed. Any advice on what to check next or how to proceed would be greatly appreciated!

The UPS has not turned on since the incident.
I suspect some components may have been damaged, but I’m not sure which ones.

⟐ Edited by author December 04, 2024 at 2:37 MST

UPS: Check the correct functioning of the PCBA

Wed, 11 Sep 2024 14:13:51 -0700

Lately I can't see anything in the ViewPower program and when I contacted BlueWalker support they told me that the problem is the PCBA.

How can I check it to see if it really isn't working?

UPS Model: PowerWalker VI 1000 PSW Schuko

I have this:

How do I add port to Firewall exclusions in Windows 11?

In order to start, the following screen must appear:

How can I start it automatically?

I solved the problem.

⟐ Edited by author September 11, 2024 at 14:13 MST

UPS: Zebronics UPS not working.

Tue, 10 Sep 2024 08:03:37 -0700

My UPS,Zebronics ZEB-U725 UPS is not working when there is no main supply. If I switch it on when there is no main supply, momentarily voltage comes on its out put socket (Which can be seen by a volt meter only) then shuts down, even when load is not connected. I checked the battery voltage. It is about 11V. When I switch on the UPS the battery voltage comes slightly down ie it comes down to about 10.5V, then returns to 11V as the UPS shuts down. Please suggest solutions.

⟐ Answer edited September 10, 2024 at 8:03 MST

Luminous Cruze 2 KVA pure sine wave UPS: Why is Not charging?

Wed, 04 Sep 2024 11:22:07 -0700

Why is Not charging?

APC-Schneider Uninterruptible Power Supply - BE700G-UK ES 700: Installed in computer and still won’t turn on

Fri, 30 Aug 2024 09:29:11 -0700

I installed the power pack as instructed and computer still will not turn on.

⟐ Answered August 30, 2024 at 9:29 MST

APC Smart-UPS SMT1500RM2UC: Whys my UPS isn't turning

Mon, 05 Aug 2024 21:29:18 -0700

My Apex UPS was out of use for a short while a few weeks not it won't turn on even if it's plugged in to the wall outlet it does nothing

⟐ Commented August 05, 2024 at 21:29 MST

APC UPS: Wire ko connect kese kare

Sun, 14 Jul 2024 09:31:49 -0700

Wire ko connect kese kare

⟐ Commented July 14, 2024 at 9:31 MST

UPS: legrand ups EPO error

Fri, 12 Jul 2024 13:50:22 -0700

hello

i have legrand ups up to 60k, when i try to turn it on, it gives EPO error, althouh the jumper behind the machine is connected, and in between the pins 3 and 4

i don't see in the machine settings something related to EPO if NC or NO

is this can be hardware problem?, or how solve?

anyone familiar with legrad ups?

UPS: Identifying & Disabling piezoelectric component in Liebert GXT3 UPS

Wed, 19 Jun 2024 07:22:21 -0700

I bought on eBay an used Liebert GXT3 2000VA UPS for my desktop computer. When power goes off (pretty common where I live) the UPS takes over and its alarm immediately starts beeping, something like once every 3 seconds, what for some people/company may be useful, but it is pretty annoying for me.
I am not electronic savvy but I have discover that the electronic component responsible for the alarm sound is a thing called piezoelectric component. Most of these things are like a small cylinder with a hole in the center, but when opening the UPS I could not locate such a thing.
I have 2 questions:

Could anyone point me exactly where it is located ?
How to properly disable it for good ?

Thanks for any help.

⟐ Answer accepted June 19, 2024 at 7:22 MST