Preventing birdbath freezing in winter–need ideas?

Have birdbath; want water in it for the winter. Live in MD; expect freezing weather at some point. DON’T TRUST electricity and water together much, esp. outside—it’s a silly quirk. Anybody ever use a solar or battery operated heater and can give feedback?

Personally, I would get another one, and rotate the two. Leave one outside until it freezes then bring it in to thaw, and take the other out. As long as they have access twice a day for an hour or two they will be fine. Or else they will do whatever it was their ancestors did 2-300 yrs. ago before we were here to ruin their perfect habitat!!! Their instinct for survival is thousands of years old, and besides what looney-bird takes a bath outside when it’s that cold??? Good luck, also running water doesn’t freeze–let the hose trickle into it—

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