US Telco Support > Verizon > Verizon Fiber Optics > The box with the px12072 battery in it. What is it?

The box with the px12072 battery in it. What is it?

You can replace the battery yourself. It's a standard 7AH 12V battery with F2 terminals.

It's a battery backup. It provides you with phone service for a certain length of time in the event of a power outage.

Disconnecting and reconnecting the battery can sometimes temporarily quiet the alarm.
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So put me on a highway, and show me a sign.
And take it to the limit one more time...

Thanks for the fast reply!!

It's interesting that it's for telephone service, since I only use FIOS for the internet. I use Vonage for phone.

Can I just shut the box with the px12072 battery off?

Does it provide any function for the internet line at all?

In my case, I have an older ONT with a combination battery-backup and power supply. You can't turn it off.

My brother got FIOS more recently, and his ONT actually has the battery right in it.

It has been debated on here whether or not the battery provides other functionality (internet/tv) going in the event of a power outage. I don't recall the final conclusion.
--
So put me on a highway, and show me a sign.
And take it to the limit one more time...

Your disconnecting & reconnecting the battery trick worked.

no more screeching.

I'll order a battery online.

Thanks again for your help.

It's a necessary part of the configuration regardless of whether you get phone, internet, or t.v. It feeds power to the ont from the power supply and needs to remain connected. The easiest thing is to replace the battery. It will provide power for internet and or t.v. for only about 10 minutes during a power outage.

reply to jackpearson1
To answer your "who is responsible", Fios for the warranty period of 1 year. After that you are.

reply to John97