1. Introduction
This manual provides essential information and instructions for the C S Replacement Battery. This high-capacity 6V/2100mAh battery is designed to provide reliable power for a range of compatible electronic devices and incorporates multiple safety features for user protection.

Image 1: Angled view of the C S Replacement Battery, displaying the product label with part number, voltage, and capacity.
2. Safety Information
Please read and understand all safety instructions before using this battery. Failure to follow these instructions may result in fire, electric shock, or injury.
- Do not disassemble: Never attempt to open or disassemble the battery pack.
- Avoid short-circuiting: Do not short-circuit the battery terminals with any metal objects.
- Proper disposal: Do not dispose of the battery in fire or water. Recycle responsibly.
- Temperature limits: Avoid exposing the battery to extreme temperatures, direct sunlight, or high humidity. The recommended charging temperature is 0°C to 40°C (32°F to 104°F).
- Keep away from children: Store the battery out of reach of children.
- Integrated protection: This battery features built-in protection against over-charge, over-discharge, over-heat, over-current, and short-circuit to ensure safe operation.
3. Compatibility
This replacement battery is compatible with a wide range of devices. Please verify your device model or original battery part number before installation.
Compatible Device Models:
- KD-S550, KD-S840
- K-H150
- KX-1, KX-1E, KX-70, KX-70E, KX-77, KX-77E, KX-80, KX-90, KX-90E, KX-90U, KX-90V, KX-H1, KX-H1E, KX-H3E
- RD-S530
- RX-1, RX-70, RX-9O
Compatible Battery Part Number: NP55
4. Specifications
| Feature | Specification |
|---|---|
| Voltage | 6V |
| Capacity | 2100mAh / 12.60Wh |
| Dimensions (L x W x H) | 88.95 mm x 47.55 mm x 20.73 mm |
| Weight | 260.5g |
| Battery Cell Composition | Lithium Ion |
| Reusability | Rechargeable |
| Certifications | ROSH, CE, UL |

Image 2: Top-down view of the C S Replacement Battery, showing its compact form factor.
5. Setup
- Unpacking: Carefully remove the battery from its packaging. Inspect the battery for any visible damage. Do not use if damaged.
- Initial Charge: For optimal performance and to activate the battery, fully charge it before its first use. Refer to your device's user manual for specific charging instructions and recommended charger.
- Installation: Insert the battery into your compatible device. Ensure correct polarity and a secure fit within the battery compartment. Consult your device's user manual for detailed installation steps, as procedures may vary by device model.
6. Operating Instructions
- Charging: Always use the charger specified by your device manufacturer. Using an incompatible charger or overcharging can damage the battery and potentially the device. Disconnect the charger once the battery is fully charged.
- Discharging: The battery is designed for high capacity circulation. Allow the battery to discharge naturally during device use. While the battery has over-discharge protection, avoiding frequent complete drainage can help prolong its overall lifespan.
- Usage Environment: Operate your device with the battery within normal temperature ranges. Extreme cold or heat can affect battery performance and longevity.
7. Maintenance
- Storage: When not in use for extended periods, store the battery in a cool, dry place, away from direct sunlight and extreme temperatures.
- Long-Term Storage: If storing the battery for several months, it is recommended to charge it to approximately 50% capacity every 3-6 months to prevent deep discharge and maintain battery health.
- Cleaning: If necessary, gently clean the battery terminals with a dry, clean cloth to ensure good electrical contact.
- Avoid Impact: Do not drop the battery or subject it to strong impacts.
8. Troubleshooting
- Battery not charging:
- Ensure the charger is properly connected to both the power source and the device.
- Verify that the battery is correctly inserted into the device.
- Check for any visible damage to the battery, charger, or charging port.
- Try using a different compatible charger if available.
- Shortened battery life:
- Battery capacity naturally diminishes over many charge cycles.
- Ensure proper charging and storage practices as outlined in this manual.
- If the issue persists significantly, the battery may be nearing the end of its lifespan and require replacement.
- Device not powering on with new battery:
- Confirm the battery is fully charged before attempting to power on the device.
- Double-check that the battery is correctly and securely installed.
- If the device still does not power on, consult your device's user manual or contact the device manufacturer's support.
9. Warranty and Support
This C S Replacement Battery is backed by a commitment to quality and customer satisfaction.
- Warranty: This product includes a 12-month warranty from the date of purchase, covering manufacturing defects.
- Money Back Guarantee: A 14-day money-back guarantee is offered, allowing you to return the product if you are not satisfied.
- Customer Support: For any questions, concerns, or assistance regarding this product, please contact our customer support team. Refer to your purchase documentation for specific contact information.