Recommend cordless phone that will work during power failure?

I have one of those boxes, that need 16 batteries. I didn't have to harrass them to get it -- it arrived with the installer -- but I can't think of any phone converstaion I have that is worth the price of 16 batteries. So far, the Verizon FIOS has worked without any interruption I've noticed. Several years.

Because of a leaking water main, I think they turned off the water to my home this morning, but even though I got up at 9, it was 4 before I drank any water, and that was from the bottle next to my desk. I think the water is back on now and I never missed it.

We also have a multi handset Panasonic unit that will power from the handset in the base unit . It too is on a UPS that also powers the modem and router plus my desktop comp . I usually turn off the desktop and use one of the laptops if I need to use the 'net while we have no power .

Good idea. Thanks.