Question about Belkin (F6C1500-TW-RK) (F6C1500TWRK) UPS System

1 Answer

Belkin F6C1500-TW-RK discharged new batteries, won't recharge

Belkin F6C1500-TW-RK. Replaced batteries for first time in 4 year old UPS. Batteries were new, 12.5V via multimeter before installation. Turned unit on, monitoring software indicated 24.5V and 82% capacity. Left plugged in overnight with no load, capacity dropped to 70%. Decided to use anyway (needed the outlets!), now dead after two days. Multimeter reads 3.5V and 1.5V; batteries obviously not charging. Measure only minimal current and voltage directly from internal UPS leads (red and black wires) with batteries disconnected, but of course can't actually turn the unit on this way (current even drops slowly when I press and hold the power button). Any suggestions for further check or repair, including disassembly? Any way to rule out defective batteries? I have no other means to charge.

Posted by on

  • walletless Jan 26, 2011

    Belated addendum: I sent the new replacement batteries back to the vendor, they checked them out, said they were fine, and sent them back to me fully recharged. I tried them again in the UPS, same problem.

    Belkin generously offered to charge me an arm and a leg to ship the unit back and pay for repair (out of warranty), but I declined and have since bought a new APC UPS. I think the Belkin unit has a design defect (intentional?) that permanently damages the UPS if the batteries die and the unit is left plugged in.

  • Dave Johnson
    Dave Johnson Mar 25, 2017

    Same failure mode here. I beleive the "IG0" and "IG1" components eventually fail from thermal stress (PCB all around the big heatsink they are bolted too is dark brown discoloration, in my case 8 years worth - which I call pretty good :), resulting in draining batteries to complete exhaustion (usually destroying them) and unit appears dead. Haven't performed any further troubleshooting. If anyone tries to fix, let us know.



1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 13 Answers

This sounds like a battery issue...I would have the unit and batteries tested at your nearest batteriesplus store...

Posted on Aug 04, 2010

  • aburt Jan 19, 2011

    FYI - just had same problem. Same UPS (Belkin F6C1500-TW-RK). Replaced batteries, plugged in, no load, died w/in 48 hours. Can't turn on. I don't think it's a battery issue we're seeing here.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer


I returned from a trip to find my F6C1000W-TWRK and all devices powered off with no lights. Tried to reset the AC breaker on the back but it wasn't tripped. I confirmed good mains power then tried to power it on by holding the main power button but no action. removed the batteries (2x 7AHr 12V sealed Pb-acid) and confirmed one was 0V and the other around 2V. I attempted to charge each indpednatly on a Jusni iCharger but both wouldn't take a charge.

As this seemed suspicious that both batteries would fail simultaneously, I took the unit apart and found the two 40A on-board fuses for the DC lead intact. Then on inspecting more, there was a distinct brown discoloration around the large aluminum heatsink with "IG0" component mounted under it (and presumably "IG1" but I didn't dismantle further).

Bottomline is it appears this component can eventually overheat (likely due to an electrolytic going bad and stressing it beyond it's thermal limits until it finally fails).

I haven't attempted repair as new quality batteries are approx $60 shipped so I am going to buy an all new unit.

If anyone attempts repair for this failure mode, please post back your experience.

Thanks !

Mar 02, 2013 | Belkin (F6C1500-TW-RK) (F6C1500TWRK) UPS...

1 Answer

I have a Belkin F6C1500-TW-RK UPS that requires two batteries - the D5779 model. My question is how do I replace the batteries in the unit. I no longer have the user manual.

You can download a user manual from the Belkin WEB site.

May 29, 2011 | Computers & Internet

1 Answer

My mercury radiant 1000 inverter dose not give backup time. although my battery is new.and also tell me the salutation of increase the charging.give answer urgent pleas.

Dear, Please check following

1. Are you using correct gauge of wire for batteries (Specification mentioned in the manual)
2. You need to charge your batteries at least for 8 hours (as recommended by Mercury)
3. Please place your Inverter in a cool environment (20 to 30 C)
4. Nominal voltage of battery should be 12Volt if using 1x Battery.


Oct 11, 2010 | Belkin (F6C1500-TW-RK) (F6C1500TWRK) UPS...

1 Answer

Not holding a charge can it be repaired or better to replace?

If your UPS is not holding Charges, this means that the Battery does not carry the load when AC fails. Check to see that the batteries are okay by testing the individual batteries on load using a potentiometer load with multimeter. If the battery voltage drops below 10V replace the batteries and your UPS be okay

Jun 08, 2010 | Belkin (F6C1500-TW-RK) (F6C1500TWRK) UPS...

1 Answer

Belkin F6C1500 UPS will not run on batteries

I think your issue is that the unit is overloaded. Try this...unplug a couple of items to get the load lower...then pull the plug from the wall...did it keep those few units running while disconnected...if not then the unit could still be overloaded...unplug everything but a small electric the same thing to see if it will keep the radio playing. If this doesnt work, go by your nearest batteriesplus store and they can help.

May 04, 2010 | Belkin (F6C1500-TW-RK) (F6C1500TWRK) UPS...

1 Answer

Battery connection.

Here's the manual with battery replacement instructions. If not detailed enough, give their support line a call.

Toll Free from USA: 1 800 2BELKIN

May 29, 2009 | Belkin F6C1250-TW-RK 1250VA TOWER RACK UPS...

1 Answer

Ups repair

First Larn some English (rofl) Then try replacing the batteries,

Oct 11, 2008 | Belkin (F6C1500-TW-RK) (F6C1500TWRK) UPS...

Not finding what you are looking for?
Belkin (F6C1500-TW-RK) (F6C1500TWRK) UPS System Logo

718 people viewed this question

Ask a Question

Usually answered in minutes!

Top Belkin Computers & Internet Experts

Prashant M
Prashant M

Level 3 Expert

2260 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

Les Dickinson
Les Dickinson

Level 3 Expert

18402 Answers

Are you a Belkin Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides