I have a working router UPS with a degraded battery. It has 5V, 9V, 12V outputs. It no longer gives more than 10-15 mins backup. Can still be useful for those who just need power to be maintained until apartment generators kick in etc. When new, It used to give 6-8hrs backup with a Wi-Fi router and the ISP modem connected.
The batteries can be replaced for cheap and even upgraded. I found this
YT video which shows the procedure for the exact model I have. I wanted to do this but I do not have the tools or expertise to do a proper job.
I have the box and all accessories it came with it.
If anyone wants this, DM me. Only need to pay for shipping.
EDIT: @manohar5321 is taking this along with some other old electronic stuff. I will post subsequent updates in his existing WTB thread.