Can You Throw Away A Car Battery. Granted you would still have to stand near such a car and use the key fob about. Inside however things will be different.

The water containing dissolved salts would start conducting. If theyre alkaline batteries you can throw them away or recycle them unless your local government requires them to be disposed of at a designated facility. Inside however things will be different.
Car batteries and any other type of large lead-acid battery cant go in your household trash or recycling.
This should be obvious once you hear lead and acid two things that shouldnt. So just keep old car batteries in your stash and learn how to revive a dead car battery. I dont know if all the places take all types of batteries so you might call first. I think you can also ship the battery to.
