They just show ( best before ) on the package. There is no date of manufacture. They usually last five years though. I always pull out the stem on my watches when I don’t use them for awhile to save the battery.

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Renata 399 SR927W Batteries - 1.55V Silver Oxide 399 Watch Battery (2 Count)

Product ID: 596530134

Details

Battery capacity
53 Milliamp
Battery cell composition
Silver Oxide
Brand
Renata
Number of batteries
2 Product
Recommended uses for product
Calculators

⚡1.55V stable power

🔋53mAh high capacity

🛡️Superior leakage resistance

¥1822

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power your essentials with Swiss precision—never miss a moment!

LOW SELF DISCHARGE TECH - Keeps charge longer in storage—ready when you are, no surprises.
VERSATILE COMPATIBILITY - Perfect for watches, calculators, car alarms, keyless remotes, and memory backup devices.
LEAKAGE RESISTANT DESIGN - Protect your valuable electronics with advanced battery integrity and safety.
ULTRA COMPACT POWERHOUSE - Fits seamlessly into watches, remotes, cameras, and more without bulk or compromise.
LONG LASTING SWISS PRECISION - Experience consistent, reliable power with every battery—trusted by professionals worldwide.

Renata 399 SR927W is a premium 1.55V silver oxide battery delivering 53mAh capacity with superior leakage resistance and low self-discharge. Engineered in Switzerland for consistent performance, it powers watches, calculators, car security alarms, keyless remotes, and more, ensuring reliable, long-lasting energy in a compact form factor.

Specifications

ASIN	B09VVNG6SL
Antenna Location	Calculators,Camera,Car Security Alarm,Keyless Car Remotes,Watch,Watches
Battery Capacity	53 Milliamp Hours
Battery Cell Type	Silver Oxide
Best Sellers Rank	30,189 in Fashion ( See Top 100 in Fashion ) 73 in Watch Batteries
Brand Name	Renata
Customer Reviews	4.5 4.5 out of 5 stars (733)
Included Components	Battery
Item Weight	9 Grams
Manufacturer	Renata Batteries
Number of Batteries	2 Product Specific batteries required. (included)
Reusability	Single Use
UPC	040048065517
Unit Count	2 count
Voltage	1.55 Volts

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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¥1822

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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