home router battery backup

[Scott T Anderson via NANOG <nanog () nanog org>]

Hi NANOG mailing list,

I am a graduate student, currently conducting research on how power outages affect home Internet users. I know that the 
FCC has a regulation since 2015 (47 CFR Section 9.20) requiring ISPs to provide an option to voice customers to 
purchase a battery backup for emergency voice services during power outages. As this is only an option and only applies 
to customers who subscribe to voice services, I was wondering if anyone had any insights on the prevalence of battery 
backup for home modem/routers? I.e., what percentage of home users actually install a battery backup in their home 
modem/router or use an external UPS?

Thanks.
Scott

Reference for 47 CFR Section 9.20: 
https://www.ecfr.gov/current/title-47/chapter-I/subchapter-A/part-9/subpart-H/section-9.20