1. Introduction
This manual provides essential instructions for the safe and effective use of your Nikon MH-33 Battery Charger. Please read this manual thoroughly before using the product and retain it for future reference. The MH-33 is designed to charge specific Nikon EN-EL18 series rechargeable Lithium-ion batteries.
2. Safety Information
To prevent injury to the user or damage to the product, observe the following safety precautions:
- Use only with compatible Nikon EN-EL18d, EN-EL18c, and EN-EL18b batteries. Do not attempt to charge EN-EL18 or EN-EL18a batteries.
- Ensure the charger is connected to a compatible power source (e.g., Nikon EH-7P AC Adapter or a suitable USB power source).
- Do not expose the charger to water, moisture, or extreme temperatures.
- Avoid dropping or subjecting the charger to strong impacts.
- Do not disassemble or modify the charger. Refer all servicing to qualified personnel.
- Keep out of reach of children.
3. Package Contents
Verify that all items are present in your package:
- Nikon MH-33 Battery Charger
Note: The EH-7P AC Adapter (power source) is sold separately and is required for operation.
4. Product Overview
The Nikon MH-33 is a compact battery charger designed for specific Nikon Lithium-ion batteries. It features a single charging slot and indicators for charge status and a calibration function.

Image: Top-down view of the Nikon MH-33 Battery Charger. The charger features a battery slot, gold contact pins, and indicators for charge percentage (50%, 80%, 100%) with corresponding estimated charging times (2h, 4h, 6h). A 'CALIBRATION' button is also visible.
5. Setup
To prepare your MH-33 Battery Charger for use:
- Connect Power: Connect the MH-33 charger to a Nikon EH-7P AC Adapter (sold separately) or a compatible USB power source using a USB-C cable.
- Power On: Plug the EH-7P AC Adapter into a wall outlet. The charger's indicators may briefly illuminate.
6. Operating Instructions
6.1. Charging a Battery
Follow these steps to charge a compatible battery:
- Ensure the charger is connected to a power source.
- Insert a compatible EN-EL18d, EN-EL18c, or EN-EL18b battery into the charging slot, aligning the contacts correctly.
- The charge indicators will illuminate to show the current charge level and charging progress.
- A fully exhausted EN-EL18d battery typically takes approximately four hours to fully charge.
- Once charging is complete, all charge indicators will remain steadily lit. Remove the battery from the charger.
6.2. Calibration Function
The MH-33 can perform calibration of compatible batteries. Refer to your camera's manual for specific recommendations on when to calibrate batteries.
- Insert the battery into the charger.
- Press and hold the 'CALIBRATION' button until the calibration process begins (indicated by specific light patterns, refer to camera manual for details).
- Allow the calibration process to complete fully.
6.3. Charge Indicators
The charger features LED indicators to display the battery's charge status:
- 50% (2h): Indicates the battery is charging and has reached approximately 50% capacity, or has been charging for about 2 hours.
- 80% (4h): Indicates the battery is charging and has reached approximately 80% capacity, or has been charging for about 4 hours.
- 100% (6h): Indicates the battery is fully charged, or has been charging for about 6 hours.
- The lights will typically blink during charging and become solid when the corresponding charge level is reached.
7. Maintenance
Proper maintenance ensures the longevity of your charger:
- Cleaning: Use a soft, dry cloth to clean the charger. Do not use liquid cleaners or solvents.
- Storage: Store the charger in a cool, dry place away from direct sunlight and extreme temperatures when not in use.
- Ensure the charging contacts are free from dust and debris.
8. Troubleshooting
If you encounter issues with your MH-33 Battery Charger, refer to the table below:
| Problem | Possible Cause | Solution |
|---|---|---|
| Charger does not power on or charge. | No power supply connected or incompatible power source. | Ensure the Nikon EH-7P AC Adapter (sold separately) or a compatible USB power source is correctly connected and plugged into a working outlet. |
| Battery not charging. | Battery not inserted correctly or incompatible battery. | Re-insert the battery, ensuring contacts align. Verify the battery is an EN-EL18d, EN-EL18c, or EN-EL18b. |
| Charge indicators behave erratically. | Faulty battery or charger. | Try a different compatible battery. If the issue persists, contact Nikon support. |
9. Specifications
| Feature | Detail |
|---|---|
| Model Number | MH-33 (Nikon 27218) |
| Compatible Batteries | EN-EL18d, EN-EL18c, EN-EL18b Lithium-ion |
| Output Voltage | 11.1 Volts |
| Dimensions (D x W x H) | 4 x 2.5 x 4 inches (10.16 x 6.35 x 10.16 cm) |
| Item Weight | 5.1 ounces (144.58 grams) |
| Manufacturer | Nikon |
10. Warranty and Support
For information regarding warranty coverage, service, or technical support for your Nikon MH-33 Battery Charger, please refer to the warranty card included with your product or visit the official Nikon website. Keep your proof of purchase for warranty claims.







