The half-AA (1/2AA) smart meter battery offers a unique combination of compact size and 3.6 V Li-SOCl₂ power, enabling sleeker, smaller smart meter designs without sacrificing energy density or longevity. With 94% capacity retention after 10 years and under 0.25% annual self-discharge, it minimizes field service visits and operational costs, while ISO9001-certified production and individual cell screening ensure consistent performance and reliability for cutting-edge utility applications.