NBN Power Supply battery backup

Wathing tv and then suddenly being disrupted by the annoying beeps coming from the FTTP NBN power supply? 

I really expected the NBN battery back to last a little longer than it did, mine lasted only two years. Apparrantly it is quite normal...

The NBN Co states the following on their website: 

"

In some instances, providers will install an optional battery backup in the nbn™ supplied Power Supply unit in your premises. This battery backup will supply emergency power to the nbn™ connection box in the event of an extended power outage. If your provider is installing a Power Supply unit with battery backup at your premises, the battery will be included.

In the case of a power outage, the battery backup will last up to approximately five hours. You will know when it's time to replace the battery when you see a red light appear next to ‘Replace Battery’ on the nbn™ connection box. You will also hear an alarm sound – one beep every 15 minutes indicates the battery needs replacing, and four beeps every minute indicates less than half of the battery charge is remaining."

It is your own duty to replace the battery, hopefully, unlike me you have a tech savvy husband. Luckily, I found a Brisbane based IT company that comes out to your house and replaces the battery. They can take the old battery away to be recycled if you dont want it.