Seizaiken SEIKO 379 SR521SW Silver Oxide Watch Battery 1.55V

Precise timekeeping requires a precise energy source – the Seizaiken / SEIKO 379 SR521SW silver oxide watch battery delivers a stable 1.55V voltage for high-quality wristwatches and precision instruments. This ultra-compact button cell, measuring 5.8mm in diameter and 2.2mm in height, is ideal for elegant ladies' watches, thin quartz movements, and other precision applications where reliability in a compact space is essential.

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 379/SR521SW/AG0 types, making it a flexible professional solution for workshops and end users.

Key features:

• Seizaiken / SEIKO 379 SR521SW 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 5.8 mm, Height 2.2 mm – Compact size SR521SW/379

• 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 elegant ladies' watches, pocket watches and thin quartz movements

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

• Ultra-compact format – perfect for slim 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 379/SR521SW/AG0/G0 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 elegant women's and luxury watches

• Saves on costly watch repairs due to long operating life