I have. You don’t need it. Charge your cell in your car if there’s a power outage.
I got a cordless phone that uses an extra battery to run the phone when there is a power outtage. Kinda neat to make a call when everybody else’s landline is down.
For power outages, as a poster mentioned, you can charge in your car, or have backup battery systems. I have one of those car battery jumpers that has a place to plug in and it will run a cell phone for days.