Varta Silver Oxide Button Cell Watch Battery - 379/SR521SW
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Product Information
Full details
The Varta 379/SR521SW is a specialized silver oxide button cell battery engineered for individuals requiring consistent power for precision timepieces and small electronic gadgets. It offers a stable 1.55V output and a 14mAh capacity, ensuring long-lasting reliability for low-drain devices; however, users should verify their device's specific battery code requirements, as this cell features exact dimensions of 5.8mm x 2.15mm.
All features
| Model Part Number | 379SR521SW |
|---|---|
| Brand | Varta |
Extended Product Information
FAQs
Is this battery rechargeable?
No, this is a single-use silver oxide battery. Attempting to recharge it can cause leakage or damage.
What does SR521SW stand for?
It is an industry-standard designation referring to the physical size, chemistry (Silver Oxide), and low-drain discharge profile.
Can I use this for my digital watch?
If your digital watch manual specifies the SR63 or 379 battery type, this cell is perfectly compatible.
How should I store these batteries?
Store in their original packaging in a cool, dry location away from metal objects that could cause a short circuit.
Are these batteries mercury-free?
Varta produces these cells according to modern environmental standards, which typically exclude mercury.
How do I know if the battery is dead?
A drop in voltage usually manifests as the watch losing time or the device failing to power on entirely.
Troubleshooting
Watch is not keeping time accurately after replacement
Ensure the battery is fully seated in the terminal and the contacts are free of dust or debris.
Battery compartment is difficult to close
Verify the battery is the correct 5.8mm x 2.15mm size and is oriented correctly for the polarity of the device.
Pros and Cons
Pros
- High-quality silver oxide chemistry for stable energy
- Compact and lightweight design at just 0.23g
- Excellent for low-drain electronic applications
- Wide cross-reference compatibility with SR63 and D379
- Precise dimensions for a secure electrical connection
Cons
- Not suitable for high-drain devices
- Single-use battery design cannot be recharged
- Small size requires careful handling to avoid loss or ingestion
Setup, Compatibility & Care
To install, ensure your device is powered off. Open the battery compartment using a small precision screwdriver or the device-specific tool. Remove the depleted cell and insert the new Varta battery, noting that the flat side with text is usually the positive (+) terminal. Avoid touching the battery surfaces with bare fingers; use plastic tweezers to prevent skin oils from interfering with contact conductivity. Keep the battery in a cool, dry place until use, and dispose of the used cell at a designated battery recycling collection point.