Seizaiken SEIKO 362 SR721SW Silver Oxide Watch Battery 1.55V

Precise timekeeping requires a precise energy source – the Seizaiken / SEIKO 362 SR721SW silver oxide watch battery delivers a stable 1.55V voltage for high-quality wristwatches and precision instruments. This compact button cell, measuring 7.9mm in diameter and 2.1mm in height, is ideal for elegant standard watches, universal quartz movements, and other precision applications where reliability is paramount.

As a brand of Seiko Instruments, Seizaiken batteries are 100% manufactured in Japan and are trusted by watchmakers and service centers worldwide for their high long-term stability, leak-proof design, and consistent voltage curve. The silver oxide chemistry ensures more consistent performance and longer runtimes than alkaline batteries – ideal for watches intended to run reliably for years. With numerous compatibility designations, this battery replaces many common 362/SR721SW/AG11 types, making it a flexible professional solution for workshops and end users.

Key features:

• Seizaiken / SEIKO 362 SR721SW Silver Oxide Watch Battery, 1 piece in blister pack

• Chemistry: Silver oxide – stable voltage and long runtime for watches

• Nominal voltage: 1.55V – constant supply for precise quartz movements

• Dimensions: Diameter 7.9 mm, Height 2.1 mm – Standard size SR721SW/362

• Made in Japan – Seiko Instruments quality manufacturing

• High reliability and very good leak protection thanks to optimized sealing.

• Specifically designed for watches – suitable for analog and digital models

• Universally applicable in small electronics such as watches, mini-tools and measuring instruments

• 0% mercury – modern, environmentally conscious silver oxide technology

• Original Seizaiken / Seiko brand product – valued by watchmakers worldwide

Advantages & Applications:

• Ideal for standard wristwatches, pocket watches and universal quartz movements

• Can be used in other small devices such as mini-timers, thermometers and measuring instruments.

• Versatile format – compatible with many common watch models

• Long operating time and stable voltage for precise timekeeping over many months

• Japanese manufacturing quality – preferred by professional watchmakers

• Direct replacement for many 362/SR721SW/AG11/G11 batteries – high compatibility

• Suitable for low to medium load profiles in watches and delicate electronics

• Safe storage and long shelf life without leakage

• Reliable performance in standard, luxury and sports watches

• Saves on costly watch repairs due to long operating life