NBN backup battery can be recharged


My NBN backup battery was beeping; calling for its replacement.The alarm silence button didn’t seem to silence the beeping for long. As my installation was 3 years old, the battery was no longer covered by warranty.

Surely it is just a battery. However, the guide suggests that the battery is very particular, such as an emphasis on unusually-sized terminals.

As luck would have it, I had a spare battery from a 13 year-old alarm system with similar specs: same 12 volts, same 7.2Ah capacity, slightly smaller terminals. The battery had run two sirens and a strobe for over 10 minutes, so it was capable if just a little bit flat.

Before I swapped them over, I put both through a full recharge from my spiffy CTEK MXS 5.0. This charger will work down to 1.2 Ah on its motorcycle mode.

Charging the NBN battery worked a treat. I refitted the battery and the battery warning alarm has been silent since.

Charging the alarm battery failed; the charger would not progress from the first of its 7 phases so the battery was a brick.

The irony of all of this is that the backup battery does nothing to keep my VOIP online.

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2 thoughts on “NBN backup battery can be recharged

  1. NBN modems seem top have a habit of throwing false negatives telling you to replace the battery. In my experience there has been absolutely nothing wrong with the batteries in question. You can reset the modem by disconnecting the battery for a few seconds and re-connecting or apparently if your modem has the 2 blue buttons – holding them both in at the same time for 5 to 10 seconds. I expect a lot of people have thrown away good batteries and payed for replacements unnecessarily.

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