When selecting silver oxide batteries (SR series), buyers must distinguish between High Drain and Low Drain types. High drain batteries are essential for devices with sudden power surges like backlit watches or medical alarms, while low drain versions are optimized for analog watches and calculators. Ensure the nominal voltage is a stable 1.55V, which is the hallmark of silver oxide technology, providing a flatter discharge curve than alkaline alternatives. Always verify the leakage resistance, as premium suppliers use twice-sealed gaskets to protect sensitive electronic circuitry.