The other day I stopped in adventure hobbies(Chandler) just to check it out.The guy in there,will call him Mr. Knowitall said that Ni-cads are better to be stored in a charged state and theres no need to discharge them.He said quote"I've flow RC planes for 12 years and no one knows Ni-cads better than a plane flyer."so is this true? I've always discharged them,he says not to.Whats the deal?