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^=5cu^ Rear view and mirrored front view of RCA Personal radio receiver showing newly developed long-life "A" and "B" batteries in position. In foreground is a "B" battery with case opened to show stacks of alkaline cells. cient utilization of the cell's active materials. Accord- ingly, it is possible to reduce the size of both cell and battery. The "crown type" cell employed in the new battery is a compact, self-contained unit which delivers more useful energy per unit of volume than do conventional types of cells. The cell resembles two shallow soda bottle caps placed near together, and measures only 0.9 inch in diameter and 0.23 inch high. Sandwiched between the two "bottle caps," within a protective plastic ring, are the positive electrode can, the positive and negative electrodes, and the electrolyte pad. One cap serves as the positive terminal; the other, the negative. To take full advantage of the new alkaline battery's longer playing life, the conventional lV2-volt "A" bat- tery was redesigned to make possible balanced-life operation with the new "B" battery in a "personal" portable. RCA's new "A" battery is approximately twice the length of the popular "sealed-in-steel" type, but has a life capacity nearly four times greater. In a i Continued on page 50) Long-Life Batteries Give Greater Playing Capacity to Personal Radio Sets jLt_Lore than a million dollars and three years of engineering research preceded the development of the revolutionary new alkaline "B" radio battery now being marketed by the Tube Department of RCA Victor Division. The new battery is nearly 25 per cent smaller than present comparable types, yet offers double "per- sonal radio' playing capacity for the modern radio set designed around it. The 671/^-volt "B" battery, specifically designed for use in personal portable radios, is the first radio dry battery to utilize the alkaline-cell principle which here- tofore had been applied successfully only to wet-type, non-portable batteries. The alkaline principle makes possible a more effi- POSITIVE CAP POSITIVE- t J. ELECTRODE CAN P 1 POSITIVE ELECTRODE ELECTROLYTE PAD i^ J NEGATIVE :"" "'^ ELECTRODE V_ ^J PLASTIC RING NEGATIVE CAP Sketches showing elements of RCA's long-life alkaline cells which provide double playing capacity for radio receivers designed around them. RAD/O AGE 25