Went to start up the bike and the battery was barely cranking. (Been a while since I've started it).

So I stuck the battery on charge overnight. Went to start it the next day, it slowly cranked for a second, then all I heard was the starter Whizzing away and no engine turn.

The whizzing was still slow like the battery is dead, but is this the sound I dont want to hear?

Does this mean my casing broke holding the starter gear?

Wheres that thread at?

Any other CHEAPER ideas of what it could be? I really like to put a fresh battery in and see what happens. But something tells me the starter shouldnt be turning that "free". Right?
Thanks