Retevis FJ9121B2
Retevis RT22 Series Li-ion Battery User Manual
Model: FJ9121B2
Introduction
This manual provides essential information for the safe and effective use of your Retevis RT22, RT22S, RT15, RT19 series Li-ion battery. Please read this manual thoroughly before using the product to ensure optimal performance and longevity.
Product Features
- Voltage: 3.7V
- Capacity: 1000mAh
- Power: 3.7Wh
- Compact and portable design for ease of use in various environments.
- Provides approximately 8-12 hours of usage after a 3-hour charge.
- Designed as an original replacement or backup battery.

Image: Two Retevis RT22 Li-ion batteries, highlighting their compact design and specifications.
Compatibility
This battery is specifically designed for use with the following Retevis two-way radio models:
- Retevis RT22
- Retevis RT22S
- Retevis RT15
- Retevis RT19
- WLN KD-C1

Image: The Retevis RT22 battery shown with compatible walkie-talkie models, including RT22, RT22S, RT15, and RT19.
Setup
- Unpacking: Carefully remove the battery from its packaging. Inspect for any visible damage.
- Initial Charge: For first-time use, fully charge the battery before installation. Connect the battery to a compatible Retevis charger. The charging indicator on the charger will typically show red during charging and turn green when fully charged.
- Installation: Ensure the walkie-talkie is powered off. Align the battery contacts with the terminals inside the battery compartment of your compatible Retevis radio (e.g., RT22, RT22S, RT15, RT19). Gently push the battery into place until it clicks securely.

Image: The battery correctly positioned within the walkie-talkie's battery slot, ready for installation.
Operating Instructions
Charging the Battery
- Use only the specified Retevis charger for this battery pack.
- Charging time is approximately 3 hours for a full charge.
- Do not overcharge the battery. Disconnect once fully charged.
Battery Usage
- A fully charged battery provides approximately 8-12 hours of typical usage, depending on transmission frequency and power settings.
- Monitor your radio's battery indicator to determine remaining power.
- For optimal battery life, avoid completely draining the battery before recharging.

Image: The Li-ion battery in context, demonstrating its role in powering the walkie-talkie for communication.
Maintenance and Safety
- Storage: Store the battery in a cool, dry place away from direct sunlight and extreme temperatures. If storing for extended periods, charge the battery to about 50% capacity.
- Cleaning: Use a dry, soft cloth to clean the battery and its contacts. Do not use harsh chemicals or abrasive materials.
- Disposal: Do not dispose of the battery in fire or with household waste. Follow local regulations for proper disposal of Li-ion batteries.
- Safety Warnings:
- DO NOT disassemble the battery.
- DO NOT dispose of in fire.
- DO NOT charge the battery in hazardous locations.
- DO NOT short-circuit the terminals.
- USE SPECIFIED CHARGER TO CHARGE BATTERY PACK.

Image: The reverse side of the battery displaying important safety warnings and cautions regarding handling and charging.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Battery not charging | Incorrect charger used; poor contact; faulty battery/charger. | Ensure you are using the correct Retevis charger. Check battery and charger contacts for cleanliness and proper connection. Try another known-good battery or charger if available. |
| Short battery life | Battery not fully charged; high power usage; aging battery. | Ensure battery is fully charged before use. Reduce transmission power if possible. If battery is old, consider replacement. |
| Radio not powering on with battery | Battery not installed correctly; battery completely drained; faulty battery. | Re-install the battery, ensuring a secure connection. Charge the battery fully. Test with another battery if available to isolate the issue. |
Specifications
| Attribute | Value |
|---|---|
| Model Number | FJ9121B2 |
| Battery Type | Li-ion |
| Voltage | 3.7V |
| Capacity | 1000mAh |
| Power | 3.7Wh |
| Item Weight | 0.74 ounces (approx. 0.05 Pounds) |
| Product Dimensions | 2.05 x 1.3 x 0.2 inches |
| Manufacturer | Retevis |
| Date First Available | April 19, 2017 |

Image: Detailed view of the battery, including its physical dimensions for reference.
Warranty and Support
Retevis provides the following warranty and support for this product:
- Warranty Period: 1 year warranty for accessories.
- Return Policy: 30 days no-reason return.
- Post-Warranty Service: Maintain service is still offered beyond the warranty period; buyers are required to cover corresponding costs.
- Contact Support: For any inquiries or support needs, please contact Retevis through Amazon. They aim to reply within 12 hours.
For further assistance, please visit the official Retevis store on Amazon: Retevis Amazon Store
Ask a question about this manual
Ask about setup, troubleshooting, compatibility, parts, safety, or missing instructions. Manuals+ will review the question and use this page’s manual context to help answer it.






