(slang) an artillery term. A gun, after it fires, is said to go out of battery, which is to say, it recoils. Then it is supposed to go back to battery, which is sitting the way you see a gun in photographs. It is used as a slang term to indicate somebody who is now fixed up; he will be all right for something, or what he has had will now be over. —PDC Volume 7 Approved Glossary