This notebook contains dated entries from March 1904. All entries are by Edison. Most of the notes and drawings relate to storage batteries. Included are items pertaining to the composition of the grids, separators, and electrolytic solutions used in the cells. There are also notes concerning compounds for use in alternating current rectifiers and phonograph cylinders; and a 3-page memorandum concerning the organization of a company to manufacture and sell batteries, possibly in Germany. The pages are unnumbered, and at least one page has been removed from the book. Approximately 70 pages have been used.