These days most people have landlines and most likely any devices plugged into the NTD won't have power to function anyway during a blackout, so you don't really need it and besides we all have mobiles these days.
How do you stop the annoying beeping?
Just remove the battery from the box. Simple eh?
so, turns out just removing a dead #nbn backup battery stops the 15 minutes peeps and the internet still works... nobody suggested this :(— Zac Spitzer (@zackster) October 4, 2016