The only dated entry in this notebook is from April 1906. All entries are by Edison. The book contains storage battery endurance tests for cells using cobalt or nickel flake. The tests involved the use of various substances to hold the flake in the cell tube, including molasses, glucose, and caramel. There are also entries regarding experiments with the Lalande primary battery. The pages are unnumbered. Approximately 100 pages have been used.