BA–11.—This battery consists of a single cell of the “reserve” or “desiccated” type, commercially known as the No. O–4 size. The cell is not cylindrical but is of oval cross section and is contained in a paraffined cardboard carton. The hollow carbon electrode and the zinc can are provided with either spring terminals, as Fahnestock or other clips, or with binding posts. The cell is about 2-3/8 by 1-3/8 by 4-3/4 inches high. Its weight when dry is about 10 ounces or 0.61 pound. It has an open-circuit voltage of 1.55 volts; an internal resistance of between 0.15 and 0.20 ohms; and almost indefinite shelf life in the dry condition and 6 months in the wet condition; and a service life which depends entirely on its use. The short-circuit current is about 8-1/2 amperes. It must be remembered that a BA–11 cell, like the BA–10, is “dead” when supplied and that water must be added before it can deliver current. The same precautions must be observed as in the case of BA–10; that is, broken pieces of cork or carbon which are loose in the hollow carbon electrode should be removed. Instructions such as the following are generally printed on the carton: This cell will require about 1 ounce of water for charging. When charging, fill the carbon electrode with water and add water as fast as it is absorbed during one hour; after the first hour, water should be added at intervals of 30 minutes until about 1 ounce has been used. Allow the cell to stand for one hour after the last addition of water and then pour out all excess water which remains in the electrode. Such a cell, however, can be used immediately if necessary, but the full voltage and current will not be attained for several hours. The same precautions against short-circuiting the cell when filling itwith water should be observed as in the case of the BA–10 cell.
- EE–6. 14 cm. projector.
- EE–7. 24 cm. projector.
- EE-24. Composite artillery telephone, battery commander type.
- Training Pamphlet no.7 Primary Batteries Jun., 1922 W.D.D. NO. 1112