---
product_id: 305063053
title: "SR521SW (379) Silver Oxide Watch Battery (Pack of 5)"
brand: "seizaiken"
price: "€ 6.91"
currency: EUR
in_stock: true
reviews_count: 8
category: "Seizaiken"
url: https://www.desertcart.fi/products/305063053-sr521sw-379-silver-oxide-watch-battery-pack-of-5
store_origin: FI
region: Finland
---

# 0% mercury eco-safe 1.55V stable power leakage-resistant design SR521SW (379) Silver Oxide Watch Battery (Pack of 5)

**Brand:** seizaiken
**Price:** € 6.91
**Availability:** ✅ In Stock

## Summary

> ⏱️ Keep Time, Stay Ahead – Power Your Watch with Confidence!

## Quick Answers

- **What is this?** SR521SW (379) Silver Oxide Watch Battery (Pack of 5) by seizaiken
- **How much does it cost?** € 6.91 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/305063053-sr521sw-379-silver-oxide-watch-battery-pack-of-5)

## Best For

- seizaiken enthusiasts

## Why This Product

- Trusted seizaiken brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Power That Lasts:** Reliable 1.55V output keeps your watch ticking flawlessly.
- • **Precision Engineered:** Manufactured in a clean room for unmatched consistency and quality.
- • **Value Pack Advantage:** Five genuine batteries to keep your timepieces running without interruption.
- • **Leak-Proof Confidence:** Advanced crimping technology prevents messy leaks and damage.
- • **Eco-Friendly Innovation:** Mercury-free composition aligns with your green lifestyle.

## Overview

The SR521SW Silver Oxide Watch Battery delivers a stable 1.55V power supply with zero mercury content, ensuring an eco-friendly and reliable energy source. Engineered with advanced leakage resistance and produced in a high-precision clean room, this pack of five genuine batteries guarantees consistent performance for your wristwatches.

## Description

EcologyThe introduction and adoption of new technologies made it possible to avoid using mercury and lead, which are environmentally harmful. Excellent leakage resistance Other than eliminating the need for mercury in the compound, these batteries are manufactured to have excellent leakage resistance attained by our newly developed crimping structure. This is made possible by our new high-performance manufacturing machinery and process.High reliability Production in our high precision clean room environment thoroughly prevents contamination – resulting in the most consistent, highest reliability battery.

Review: Good - Genuine product
Review: Good one. - A good product.

## Features

- 0% Mercury
- SW Button cell 1.55V for Wrist Watch
- Environment Safe and Low Self Discharge
- Do not try to Charge it (Non - Rechargeable)
- Cell Battery for Watches

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01EBCFWYG |
| Antenna Location | Watch |
| Battery Cell Composition | Silver Oxide |
| Battery Cell Type | Silver Oxide |
| Brand | Seizaiken |
| Brand Name | Seizaiken |
| Country of Origin | India |
| Customer Reviews | 3.9 out of 5 stars 135 Reviews |
| Item Type Name | watch |
| Manufacturer | Seiko Instruments Inc. |
| Net Quantity | 5 Count |
| Recommended Uses For Product | Watch |
| Reusability | Rechargeable |
| Unit Count | 5 Count |
| Voltage | 1.55 Volts |

## Product Details

- **Battery Cell Composition:** Silver Oxide
- **Brand:** Seizaiken
- **Compatible Devices:** Watch
- **Manufacturer:** Seiko Instruments Inc.
- **Net Quantity:** 5 Count
- **Recommended Uses For Product:** Watch
- **Reusability:** Rechargeable
- **Voltage:** 1.55 Volts

## Images

![SR521SW (379) Silver Oxide Watch Battery (Pack of 5) - Image 1](https://m.media-amazon.com/images/I/81jYLytb69L.jpg)
![SR521SW (379) Silver Oxide Watch Battery (Pack of 5) - Image 2](https://m.media-amazon.com/images/I/819lCRWfuuL.jpg)

## Questions & Answers

**Q: How many year it will work**
A: Typically 1-2 years

**Q: Can I get only one quantity**
A: No, may not be practical for the seller

**Q: I need 100 batteries. What is the cost?**
A: Multiply by 10

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good
*by M***I on 29 September 2024*

Genuine product

### ⭐⭐⭐⭐ Good one.
*by B***H on 19 May 2022*

A good product.

### ⭐⭐⭐⭐⭐ Working well
*by M***J on 18 June 2022*

It was very difficult to find this battery in the shop, found online and it is working perfectly in Swatch watch.

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**Shop now:** [https://www.desertcart.fi/products/305063053-sr521sw-379-silver-oxide-watch-battery-pack-of-5](https://www.desertcart.fi/products/305063053-sr521sw-379-silver-oxide-watch-battery-pack-of-5)

---

*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-02*