The thermometer and watch battery people appear to be in cahoots. We've had this outdoor digital thermometer since we bought our house, and in the ~20 months since we've moved, it has displayed this "change battery soon" warning for nearly 15 of them.
I'll put a new battery in it when it dies, thanks.
wow - its warm over there.
Very—and it's getting warmer, too.
It's good to live near the water.
--D