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Button/coin battery Energizer 321 Silver‑Oxide 1.55 V, 6.8×1.6 mm, single‑use (1 pc)
Summary description:
Energizer 321 is a single‑use button/coin battery using silver‑oxide chemistry with nominal voltage 1.55 V. Dimensions are 6.8 mm diameter and 1.6 mm height. Supplied as one cell, it is suitable for small electronic devices such as watches, calculators, key fobs, and medical instruments requiring a stable low‑drain power source.