BA–14 and BA–24; general description.—These are Edison cells of commercial type generally known as “Edison primary cells” so as to distinguish them from the Edison secondary or storage cells. They are a development, with minor improvements, of earlier types known as the Edison-Lalande and Edison-BSCo cells. They are closed-circuit, single-fluid cells, with a solid depolarizer, and are of 200 ampere-hour capacity. The cells have an open-circuit voltage of about 0.95 volt, and an internal resistance of between 0.1 and 0.3 ohm. They are used in the Signal Corps for meteorological work, etc. Their life is from six weeks to six months, depending on the amount of current which they must supply.
- Training Pamphlet no.7 Primary Batteries Jun., 1922 W.D.D. NO. 1112