1. Introduction
This manual provides essential instructions for the safe and effective use of your Nikon EN-EL18 Rechargeable Li-ion Battery. Please read this manual thoroughly before using the battery to ensure proper operation and to prevent damage to the battery or your camera. Keep this manual accessible for future reference.
2. Safety Information
WARNING: Failure to follow these safety instructions could result in fire, electric shock, injury, or damage to the battery or camera.
- Use only Nikon-approved chargers for the EN-EL18 battery. Using incompatible chargers may cause fire or explosion.
- Do not disassemble, modify, or attempt to repair the battery. This can cause overheating, fire, or injury.
- Keep the battery away from water, moisture, and high humidity. Exposure to liquids can cause short circuits and corrosion.
- Avoid exposing the battery to extreme temperatures (above 60°C / 140°F or below 0°C / 32°F). High temperatures can cause the battery to swell, leak, or explode. Low temperatures can reduce performance.
- Do not short-circuit the battery terminals with metal objects. This can cause excessive heat, fire, or damage to the battery.
- Keep the battery out of reach of children and pets.
- If the battery leaks, swells, or emits an unusual odor, discontinue use immediately and dispose of it properly.
- Do not drop or subject the battery to strong impacts. This can damage internal components.
3. Product Overview
The Nikon EN-EL18 is a high-capacity rechargeable Lithium-ion battery designed specifically for use with Nikon D4 Digital SLR cameras. It provides reliable power for extended shooting sessions.

4. Setup
4.1. Charging the Battery
- Ensure you are using a compatible Nikon battery charger (e.g., MH-26 or MH-26a, sold separately).
- Insert the EN-EL18 battery into the charger, aligning the terminals correctly.
- Connect the charger to a power outlet. The charging indicator on the charger will illuminate, typically blinking to indicate charging in progress.
- Charging is complete when the indicator light stops blinking or changes color, depending on the charger model. Refer to your charger's manual for specific indicator behavior.
- Disconnect the charger from the power outlet and remove the battery.
Note: A new battery or one that has not been used for a long time may not hold a full charge initially. Charge and discharge it a few times to optimize its capacity.
4.2. Inserting the Battery into the Camera
- Ensure the camera is turned off.
- Open the battery chamber cover on your Nikon D4 Digital SLR camera.
- Insert the EN-EL18 battery into the chamber, ensuring the orientation is correct as indicated by the markings inside the chamber.
- Gently push the battery until it clicks into place.
- Close the battery chamber cover securely.
5. Operating the Battery
Once the battery is charged and inserted into your Nikon D4 camera, you can power on the camera and begin shooting. The camera's display will show the remaining battery level.
- Battery Life: Battery life varies depending on usage conditions, such as ambient temperature, frequency of shooting, use of flash, and video recording.
- Cold Environments: In cold environments, battery performance may temporarily decrease. Keep spare batteries warm and swap them as needed.
- Recharging: Recharge the battery when the camera indicates a low battery level or when performance noticeably declines.
6. Maintenance
6.1. Cleaning
Wipe the battery terminals with a clean, dry cloth periodically to ensure good electrical contact. Do not use solvents or abrasive cleaners.
6.2. Storage
- When storing the battery for extended periods, charge it to approximately 50% capacity. Storing a fully charged or completely depleted battery can reduce its lifespan.
- Store the battery in a cool, dry place, away from direct sunlight and extreme temperatures.
- Remove the battery from the camera if it will not be used for an extended period.
6.3. Disposal
Do not dispose of the battery in household waste. Lithium-ion batteries contain materials that can be harmful to the environment if not disposed of properly. Recycle the battery at an authorized recycling center or return it to Nikon for proper disposal, following local regulations.
7. Troubleshooting
- Battery not charging:
- Ensure the battery is correctly inserted into the charger.
- Verify the charger is properly connected to a working power outlet.
- Check for any damage to the battery or charger.
- Camera not powering on with charged battery:
- Ensure the battery is fully charged.
- Verify the battery is correctly inserted into the camera.
- Clean the battery terminals and camera contacts with a dry cloth.
- Try a different, known-good EN-EL18 battery if available.
- Shortened battery life:
- Battery capacity naturally degrades over time and with repeated charge cycles.
- Extreme temperatures can affect battery performance.
- Review camera settings that consume more power (e.g., continuous live view, Wi-Fi, GPS).
If problems persist, contact Nikon customer support or an authorized service center.
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | 27050 |
| Battery Cell Composition | Lithium Ion |
| Voltage | 10.8 Volts |
| Reusability | Rechargeable |
| Battery Weight | 29 Grams |
| Item Dimensions (L x W x H) | 3.94 x 3.94 x 3.94 inches |
| Item Weight | 0.2 Kilograms |
| Recommended Uses | Camera (Nikon D4 Digital SLR) |
9. Warranty and Support
9.1. Warranty Information
The Nikon EN-EL18 Rechargeable Li-ion Battery is covered by a limited warranty. For detailed information regarding warranty terms, conditions, and duration, please refer to the warranty card included with your product or visit the official Nikon website. Keep your proof of purchase for warranty claims.
9.2. Customer Support
For technical assistance, service, or inquiries about your Nikon EN-EL18 battery, please contact Nikon customer support. You can find contact information, including phone numbers and online support resources, on the official Nikon website for your region.
Nikon Official Website: www.nikon.com