D Size battery
D (also R20, 373, Mono, UM) - one of the standard sizes for multipurpose batteries, used in the most energy-consuming portable electric devices like portable stereos, radiosets, GM counters, and powerful hand lights.
Wiki
D (also R20, 373, Mono, UM) - one of the standard sizes for multipurpose batteries, used in the most energy-consuming portable electric devices like portable stereos, radiosets, GM counters, and powerful hand lights.
Wiki