No Internet during power outage - Isn't the battery in the NTU supposed to keep the circuit up?

Question

During yesterday's power outage in Northern Virginia I lost all Internet connectivity; yet my NTU battery was up but my Verizon router was saying the cable wan was down.  Why?
Isn't the NTU battery supposed to keep the circuit up in case of power failure?  if is not, why did I spend $30 replacing it when it failed since Verizon is too cheap to replace it, even though we all pay them those outragous bills every month. 
Why, Why, Why
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Answer 1

Vuser wrote:
During yesterday's power outage in Northern Virginia I lost all Internet connectivity; yet my NTU battery was up but my Verizon router was saying the cable wan was down.  Why?
Isn't the NTU battery supposed to keep the circuit up in case of power failure?  if is not, why did I spend $30 replacing it when it failed since Verizon is too cheap to replace it, even though we all pay them those outragous bills every month. 
Why, Why, Why
No, only the phone circuit, for up to 8 hours, if you have phone service. Although my experience is that the battery does power the internet and TV service for a short time to cover a brief power outage.
As to why you paid $30 to replace the battery, I have no idea, you can generally get batteries locally or from Amazon, etc. for $15 to $20. And it is very clearly stated that the battery is your responsibility, you should have already known that.
If you feel FiOS too expensive, why do you have it? 
Justin
FiOS TV: Extreme HD, Internet: 50/25, Digital Voice
VMS Enhanced Service: 1 server, 2 clients
Keller, TX 76248 (VHO 1)