377 SR626SW 1.55V Silver Oxide Watch Battery (100 Pack) - Reliable

Our review of the 377 SR626SW 1.55V Silver Oxide Watch Battery (100 pack) finds it ideal for anyone who needs dependable, long-lasting cells for quartz watches and other small electronics. The bottom line: these batteries deliver consistent voltage and low self-discharge, making them a practical bulk purchase for watch repairers, hobbyists, or households that replace multiple button cells each year. The pack emphasizes Japanese manufacturing quality and leakage resistance, which is the single biggest reason to choose this set over mixed or generic coin cells.

Key Features

• Nominal Voltage: The 1.55V output is stable under typical watch loads, helping timepieces keep accurate time.
• Capacity: Rated at approximately 30 mAh, the cells provide long runtimes for small devices like watches and calculators.
• Mercury-free chemistry: The silver oxide construction contains 0% mercury, reducing environmental risks and meeting modern safety expectations.
• Low self-discharge: High capacity retention in storage means batteries remain usable after long shelf time, useful for spares.
• Leakage resistance: Designed to resist leakage, protecting delicate watch movements and electronic contacts.
• Japanese quality: Manufactured with Seiko heritage and consistent performance across hundreds of cells in a single pack.

Who It's For

This pack is best for watchmakers, jewelers, repair shops, and enthusiasts who change many cells and value consistent, high-quality silver oxide batteries. It also suits homeowners who prefer to keep a large supply on hand for watches, cameras, calculators, toys and small electronics.

Those who need specialty sizes or rechargeable cells should look elsewhere; this product is a primary choice for single-use coin cells and not intended to replace rechargeable battery systems or uncommon custom sizes.

Pros & Cons

Pros

• High and stable 1.55V output that helps watches maintain accurate time.
• Good value in a 100-count pack, which reduces per-cell cost for frequent use.
• Low self-discharge and strong leakage resistance protect devices during storage and use.
• Japanese manufacturing and Seiko heritage contribute to consistent quality across the pack.

Cons

• Sold as primary (single-use) cells, so not suitable for applications that require rechargeability.
• A large bulk pack may be unnecessary for users who only need a single replacement battery occasionally.

Specifications

Model	377 SR626SW
Chemistry	Silver oxide (0% mercury)
Nominal Voltage	1.55V
Nominal Capacity	About 30 mAh
Primary Use	Watches, cameras, calculators, toys and small electronics
Pack Quantity	100 batteries
Origin	Made in Japan

Our Verdict

For anyone who replaces multiple watch batteries or supports a repair shop, this 100-pack of 377 SR626SW cells is a sensible, cost-effective choice. The combination of stable 1.55V output, low self-discharge and strong leakage resistance delivers reliable performance and long shelf life, making it good value for frequent users who prefer high-quality, mercury-free silver oxide cells.

Frequently Asked Questions

Are these batteries suitable for quartz watches?
Yes, the 1.55V output and stable discharge make them well suited to quartz watches and similar low-drain devices.

Do these cells contain mercury?
No, the product is specified as 0% mercury, using silver oxide chemistry instead.

How long will these batteries keep in storage?
They have low self-discharge and retain a high percentage of capacity in storage, so they remain usable after long shelf periods when stored properly.