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  • Stop your NBN Power Supply Unit Beeping without replacing battery or PSU
  • By Pikey
  • 28/06/2018
  • Contributed by: Pikey ( 5 articles in 2018 )
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READ before replacing battery or PSU


Some 2 years and 8 months ago the NBN was installed in our area. A backup battery power supply unit (PSU) was also fitted. This was to power the internet and phone for about 5 hours in the event the electricity failed.

However just recently a rather annoying beeping sound emanated from a box behind our big TV and wall unit which is tough to move to gain access. It was not something I wanted to consider, so I thought or hoped I could ignore this incessant beep but I couldn't, as I knew what it meant. Yep, work and effort to resolve. Bugger!

On further examination and help from google and the NBN user guide, the beep that was sounding every 15 minutes was a battery flat or defective warning. Also confirmed by a red led indicating replace battery. Yep more trouble alright and more investigation.

Upon reading the guide and more googling, I performed the following steps in hope for a cure, preferably quick and inexpensive.

1) First was a PSU reset by holding both 'Alarm Silence' and 'Battery Emergency Use' buttons down for between 5-10 seconds. After about 7 secs I heard multiple beeps but the red led did not go off.

2) I then turned off the mains power for a few minutes and then back on. Nope that didn't kill the red led or beeping either. My thoughts of a new battery seemed inevitable.

I then began pondering whether it should have gone flat or become defective so soon?

One post stated the cost of a new battery was $50-$80 so it wasn't a quick and cheap change and let's suck it and see deal.

Then reading "if you still have the "backup replacement" light on after changing the battery, then please contact our Tech Support team on 1800 TFIBRE (1800 834 873) as the PSU may need replacement."

So was it the battery or PSU?

What were my rights and who was liable? Should I be contacting NBN and kicking up, getting a new battery replaced for FREE under consumer law or a new unit? Was there a battle in the wind or should I suck up the cost of a new battery and save my energy?

But was this rechargeable battery buggered in need of replacement, wherever it may come from? This seemed to be the first thing I needed to establish.

I was one who always liked to get to the specific root of the problem, not just replace this and that hoping to strike it lucky type of guy.

So from looking at the guide the battery was a big boy, a 12v@7.2AH sealed lead acid type. It was then I remembered from many moons ago when I changed a 12v@1.2AH battery in my home alarm, after some 10 years of faithful use. And after that experience, I learnt of the memory effect that Nicads and rechargeable batteries suffered from, effectively reducing their capacity to hold a charge and rendering them in a state of being defective. A troublesome effect even with mobile phones.

So surely the battery can't be stuffed this early in. So what of cycling the battery to clear the possible memory effect I thought. Maybe this will help re-condition the battery through a series of discharging and charging phases. It can't hurt.

3) So the mains power was switched off. The red led was still on and in addition to the System Status (green led) from before, the Battery Power (green led) was now on. The cordless phone and internet was working for about an hour before I headed out.

On my return some hours later, a number of green leds on the modem were out. There was no internet and the phone would not dial out, only hearing a loud tone.

I switched on the mains and presto. The red led and beeping was gone and in a few minutes the modem was up. That was about 2 days ago now. Yes, it took a modicum of reading but no pulling the unit apart, replacement hassles or costs.

Good for me and hope this works for you too!


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