US power sucks plenty!
Texas is an extreme example, but outages happen everywhere. It was only a bit over 10 years ago when Sandy basically hit half the US and took power out in the tristate area for weeks. With climate change making things worse…
But even when things are running well, not including the random downed line or busted transformers, its still better to give your hardware clean power and avoid the small spikes.
Worth taking a look at the battery - especially an old one on a repurposed device - before considering it safe. Spicy pillows happen.