Seizaiken 348 SR421SW 1.55V Silver Oxide Watch Battery
- Secure Checkout
- Free UK Delivery on All Orders
- 100% Genuine - Original Seizaiken Product
- Genuine Seizaiken Watch Batteries
- Low stock - 5 items left
Keep your timepieces ticking with precision using genuine Seizaiken silver oxide watch batteries - trusted worldwide for their Japanese engineering, superior longevity, and reliability.
Manufactured by Seiko Instruments, Seizaiken batteries are specially designed for watches and offer stable voltage output, leak-resistant performance, and exceptional shelf life, making them the ideal choice for both casual users and watch professionals.
- 100% Authentic - From Japan
- Fresh Stock - Long Expiry Dates Guaranteed
- Compatible with reference codes (e.g. 377, 364, 371 + more)
- Trusted by watchmakers, repairers, and collectors
- Ideal for Seiko, Casio, Citizen watches and more
Whether you're replacing a battery for a premium wristwatch or a classic timepiece, choosing Seizaiken ensures peace of mind and long-lasting performance. We dispatch quickly from UK stock, and our packaging ensures safe delivery right to your door.
Battery Size: 348 / SR421SW
Battery Type: Coin / Button Cell
Chemical Compostion: Silver Oxide - Mercury Free 0%Hg
Buy with confidence from a UK-based seller of genuine watch parts.
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Seizaiken 348 SR421SW 1.55V Silver Oxide Watch Battery
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All our products go through the highest level of quality inspections before they get shipped out.
However, should your item be delivered damaged or is faulty in anyway, please contact us immediately upon receipt and we will replace or refund you based on our returns policy. For more information, please check out our Refund & Returns page.
Do you ship worldwide?
Yes, we ship to over 200 countries around the world. At present we are unable to deliver to Israel, Russia or Ukraine.
What are your postage charges?
UK delivery is free on every order. Batteries and small watch parts are sent free by Royal Mail 2nd Class, and Casio and Seiko watch straps are always sent free by either Royal Mail 2nd Class or Tracked 48, depending on the size of the strap. Faster services, including 1st Class, Tracked 24 and Special Delivery, are available at checkout.
For the rest of the world, orders under £30 can be sent by Royal Mail International Standard for £6.95, which is untracked. Any order can be sent by Royal Mail International Tracked & Signed for £12.95, or £15.00 to the United States, and tracked delivery is free on all orders over £100 (£150 to EU countries).
More information on shipping costs can be found on our Shipping & Delivery page.
Do you provide tracking information?
Yes, if you choose a tracked service at checkout, such as Royal Mail Tracked 48, Tracked 24, Special Delivery or International Tracked & Signed, you will receive an email with your tracking number once your order ships. Royal Mail 2nd Class and International Standard are untracked, so if you would like to follow your parcel all the way, please choose a tracked service at checkout.
My tracking says “no information available at the moment”?
It can sometimes take 2 to 5 working days for tracking information to update. If your order was placed more than 5 working days ago and there is still no information on your tracking number, please Contact Us.