Introduction
This user manual provides comprehensive instructions for the Maxell SR721SW 362 Silver Oxide Button Cell Watch Battery. Please read this manual carefully before installation and use to ensure optimal performance and safety. These batteries are designed for reliable power in various small electronic devices, primarily watches.
Setup
Battery Identification
Ensure you have the correct battery model for your device. The Maxell SR721SW 362 battery is a silver oxide button cell, commonly used in watches and other small electronics. It is also known by other designations such as 362.

Image: Maxell SR721SW 362 button cell batteries in a 5-pack blister packaging. The packaging clearly displays the model number and brand.
Installation
- Prepare Your Device: Before handling the battery, ensure your device (e.g., watch) is turned off. Use appropriate tools (e.g., a small screwdriver or watch case opener) to carefully open the battery compartment.
- Remove Old Battery: Gently remove the old battery. Note its orientation (positive (+) and negative (-) terminals) to ensure correct installation of the new battery.
- Clean Contacts: If necessary, clean the battery contacts in the device with a dry, lint-free cloth to remove any dust or corrosion.
- Insert New Battery: Insert the new Maxell SR721SW 362 battery into the compartment, matching the correct polarity. The positive (+) side is typically marked on the battery and the device.
- Secure Compartment: Close the battery compartment securely.
- Test Device: Turn on your device to confirm the battery is working correctly.
Operating Instructions
Once installed, the Maxell SR721SW 362 battery will power your device. No specific operating instructions are required for the battery itself beyond proper installation. The device's functionality will depend on its own design and controls.
Maintenance
- Storage: Store unused batteries in their original packaging in a cool, dry place, away from direct sunlight and extreme temperatures. Avoid storing batteries loosely or with metal objects to prevent short-circuiting.
- Handling: Handle batteries with clean, dry hands. Avoid touching the battery terminals with bare fingers, as oils from your skin can affect conductivity.
- Disposal: Dispose of used batteries according to local regulations. Do not throw batteries into fire or attempt to recharge them.
Troubleshooting
- Device Not Working After Installation:
- Check battery orientation: Ensure the positive (+) and negative (-) terminals are correctly aligned.
- Check battery contacts: Make sure contacts are clean and free of debris or corrosion.
- Verify battery is new: Ensure the battery is fresh and not depleted.
- Device issue: If the battery is correctly installed and new, the issue might be with the device itself.
- Short Battery Life:
- Environmental factors: Extreme temperatures can affect battery performance.
- Device power consumption: Some devices consume more power than others.
- Battery age: Even unused batteries have a shelf life. Check the expiration date.
Specifications
| Feature | Detail |
|---|---|
| Brand | Maxell |
| Model Number | 362 (SR721SW) |
| Battery Cell Composition | Silver Oxide |
| Nominal Voltage | 1.55V |
| Battery Capacity | 200 Milliampere Hour (mAh) |
| Recommended Uses | Watches, small electronics |
| Package Dimensions | 4.69 x 2.8 x 0.16 inches |
| Item Weight | 0.18 ounces |
Safety Information
- Keep Out of Reach of Children: Button cell batteries can be swallowed and cause serious injury or death. Keep new and used batteries away from children.
- Do Not Recharge: These batteries are not rechargeable. Attempting to recharge them may lead to leakage, fire, or explosion.
- Do Not Disassemble: Do not disassemble, crush, puncture, or modify the battery.
- Avoid Extreme Temperatures: Do not expose batteries to excessive heat or cold, or dispose of them in fire.
- Proper Handling: Wipe the battery with a dry cloth before installation and set properly, confirming positive (+) and negative (-) ends.
- Seek Medical Attention: If a battery is swallowed, seek immediate medical attention.
Warranty & Support
For specific warranty information regarding your Maxell SR721SW 362 batteries, please refer to the packaging or contact Maxell customer support directly. General product support and inquiries can be directed to the manufacturer's official channels.





