I did that on Thursday for the monthly meeting of the Minnesota Triumphs. It was a bit chilly out, but the top on the car kept the worst of the cold out.
When starting the car in the morning (which took a while after sitting all winter), I noticed the starter made a bit of a funny sound. It almost sounded like the cog that pops out of the starter didn’t fully retract when the starter was disengaged. At best, it’s nothing. At worst, it’ll chew up the flywheel. I’m optimistic everything is fine since the starter was spinning the engine.
And, yes, the battery spent the winter in the basement of the house. I brought it out Wednesday evening and connected the charger. I was surprised to see that it was still fairly charged up.