If my battery was to vent what should I do with it would be safe to put it in the bin?
If you had the Unlikely event of a Battery Venting, the First Thing you should Think about is what am I going to do if my PV becomes to Hot to Hold. Where am I going to put it Down?
The Best place would be Outside on something Like Concrete.
Putting a Battery that has just failed in a Trash Bin with other Things that could Catch on Fire (or even the Bin Itself) would be a Bad Choice.
Also, you should wait a Good 15 or 30 Minutes before you try to Handle your PV. It can be Hot and the Battery could Smolder for awhile after the Initial Vent.
A Venting Battery is Very Rare. But it is Good you are Thinking about things even if the Chances of it Happening are Extremely Small.