Notability 

Why is this type of battery considered notable enough to have an article?  Although the article title is 'nine volt battery' it doesn't discuss any of the other types of nine volt battery and is thus wholly incomplete.

Similarly, there appears to be no articles on one and half volt batteries, three volt batteries or four and a half volt batteries etc. etc.  I note that there is an article on lantern battery, but I would argue that the same applies to that article.  There isn't very much of it any way. 212.183.140.5