Take the batteries, get a safe, lock them up, and then put security screws or McDonalds toy triangle-head screws onto any device with removable batteries. For remotes, use superglue, and dissolve it with acetone every time you need to change them out. (Superglue the cover, not the batteries themselves.)

Make sure there is no way for your child to gain access to batteries of any kind. If upset, teaching boundaries is important or it will move on to running with scissors. Get something else safe to chew on.