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)

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

Product ID: 426137899

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Details

Number of Batteries
2 Product
Brand
Renata
Battery Cell Composition
Silver Oxide
Battery Capacity
53 Milliamp
Recommended Uses For Product
Calculators

⚡1.55V stable power

🔋53mAh high capacity

🛡️Superior leakage resistance

Frequently Bought Together

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

Renata 371 SR920SW Batteries - 1.55V Silver Oxide 371 Watch Battery (2 Count)

Renata 364 SR621SW Batteries - 1.55V Silver Oxide 364 Watch Battery (2 Count)

Description

🔋 Power your essentials with Swiss precision—don’t let your devices run out of juice!

LONG LASTING CHARGE - Low self-discharge means your batteries stay fresh and ready, even after months in storage.
LEAKAGE PROOF DESIGN - Engineered to resist corrosion and leakage, protecting your valuable devices from damage.
COMPACT LIGHTWEIGHT - At just 9 grams per battery, enjoy powerful performance without the bulk.
SWISS PRECISION POWER - Experience consistent, reliable energy with every battery—because your devices deserve the best.
VERSATILE COMPATIBILITY - Perfect for watches, cameras, calculators, keyless remotes, and more—one battery to power them all.

Renata 399 SR927W Silver Oxide batteries deliver a stable 1.55V output with 53mAh capacity, featuring superior leakage resistance and low self-discharge for long shelf life. Trusted Swiss quality ensures reliable performance across watches, cameras, calculators, and keyless car remotes.

Specifications

Antenna Location	Calculators,Camera,Car Security Alarm,Keyless Car Remotes,Watch,Watches
Item Weight	9 Grams
Unit Count	2 Count
Battery Cell Type	Silver Oxide
Battery Capacity	53 Milliamp Hours
Reusability	Single Use
Voltage	1.55 Volts

Have a Question? See What Others Asked

Date of Manufacture?

Is this equivalent to the sony sr927w?

This batteries renata 399 are ok for tag heuer formula 1

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