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.

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: 587893221

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Details

Number of batteries
2 Product
Brand
Renata
Battery cell composition
Silver Oxide
Compatible phone models
watch battery
Recommended uses for product
Calculators

⚡1.55V Nominal Voltage

🔋53 mAh 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 up your essentials with Swiss precision—never miss a moment!

LONG LASTING CHARGE - Low self-discharge ensures your battery stays ready, even after months in storage—never get caught powerless.
LEAKAGE PROOF DESIGN - Engineered to resist corrosion and leakage, protecting your valuable devices from damage.
DUAL PACK CONVENIENCE - Two batteries per pack means you’re always prepared—because running out is not an option.
SWISS PRECISION POWER - Experience consistent, reliable energy with every battery—trusted for your most essential devices.
VERSATILE COMPATIBILITY - Perfect for watches, cameras, keyless remotes, and more—one battery to power your everyday tech.

Renata399 SR927W is a premium 1.55V silver oxide watch battery delivering 53 mAh capacity with superior leakage resistance and low self-discharge. Swiss-made for consistent, reliable performance across watches, cameras, keyless remotes, and more, this dual-pack ensures your devices stay powered longer and safer.

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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