364 SR621SW 1.55V Silver Oxide Watch Battery (100 Pack) - Reliable

In this review of the 364 SR621SW 1.55V Silver Oxide Watch Battery pack, the bottom line is simple: this kit is for anyone who needs a dependable, long-storing source of watch power without paying premium brand prices. The reviewer found these cells to deliver consistent voltage and excellent leakage resistance, making them a practical choice for maintaining multiple quartz watches or stocking a household kit. For those who value Japanese manufacturing and stable energy retention, this 100-battery pack stands out as a reliable, cost-effective solution.

Key Features

• Silver oxide chemistry: Provides stable 1.55V output that helps quartz watches keep accurate time over extended use.
• 100% mercury-free: Meets environmental preferences while delivering dependable performance without hazardous mercury content.
• High capacity retention: Low self-discharge means batteries keep usable charge in storage, ideal for spares and infrequent use.
• Excellent leakage resistance: Reduces the risk of corrosive damage to delicate watch movements and other small electronics.
• Versatile compatibility: Primarily suited for watches but also useful in cameras, calculators, toys and audio devices that accept this cell size.
• Japanese quality: Seizaiken heritage and Seiko-related manufacturing practices contribute to consistent, repeatable performance.

Who It's For

This pack is aimed at watch owners, hobbyists and technicians who change batteries frequently or service multiple timepieces. The large quantity and stable storage characteristics make it useful for small repair shops, collectors who keep spares on hand, and households that want a single kit for different devices.

Those who need single premium-branded cells in specialty packaging or who require button cells with unusual voltage or capacity should look elsewhere; this pack focuses on value, quantity and reliable standard performance rather than premium retail presentation.

Pros & Cons

Pros

• Consistent 1.55V output helps maintain accurate timekeeping in quartz watches.
• Good value per cell when buying in a 100-count pack, lowering replacement cost over time.
• Low self-discharge and strong leakage resistance support long storage and device safety.
• Fits standard devices that accept the 364 SR621SW size and is praised for reliable fit.

Cons

• Sold in bulk which may be more than casual users need at once and lacks single-unit retail packaging.
• Not marketed as a premium retail brand option for those who prefer branded packaging or single-cell warranty service.

Specifications

Model	364 SR621SW
Chemistry	Silver Oxide
Voltage	1.55V
Nominal Capacity	23 mAh
Quantity	100 batteries
Mercury Content	0% (mercury-free)
Made in	Japan

Our Verdict

The 364 SR621SW 100-pack is a smart buy for anyone maintaining multiple quartz watches or keeping spares for household electronics; it combines stable 1.55V output, low self-discharge and good leakage resistance at an attractive per-cell cost. For buyers who want quantity, dependable Japanese-made performance and long shelf life, this pack delivers solid value without unnecessary extras.

Frequently Asked Questions

Are these batteries safe for long-term storage?
Yes. The silver oxide chemistry and low self-discharge give these cells good capacity retention in storage, making them suitable as long-term spares.

Will these fit my watch that currently uses SR621SW?
They are the standard 364 SR621SW size and should fit devices designed for this coin cell, offering reliable fit and function.

Are these environmentally safer than older button cells?
Yes. These cells are 100% mercury-free, reducing hazardous content compared with legacy mercury-containing button cells.