1. Introduction
Thank you for choosing the OSRAM BATTERYcharge 904. This intelligent 4A battery charger and maintainer is designed to efficiently charge and maintain 6V and 12V vehicle batteries, including those found in motorcycles and most smaller vehicles. It incorporates advanced multi-stage charging technology and various safety features to ensure optimal battery health and user protection. Please read this manual thoroughly before operating the device to ensure safe and correct usage.
2. Safety Information
Always prioritize safety when working with electrical devices and vehicle batteries. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Read All Instructions: Before using the charger, read all instructions and cautionary markings on the charger, the battery, and the vehicle.
- Ventilation: Ensure the charging area is well-ventilated. Batteries can produce explosive gases during charging.
- Eye Protection: Always wear eye protection and protective clothing when working near batteries.
- Avoid Sparks: Do not smoke or allow a spark or flame in the vicinity of the battery or engine.
- Disconnect Power: Always disconnect the AC power cord from the outlet before making or breaking the connections to the battery.
- Reverse Polarity Protection: The device includes reverse polarity protection. However, always double-check connections before powering on.
- Short-Circuit Protection: The device is equipped with short-circuit protection. Avoid direct contact between the positive and negative clamps.
- Children and Pets: Keep the charger and battery out of reach of children and pets.
- Damaged Equipment: Do not operate the charger if it has received a sharp blow, been dropped, or otherwise damaged.
3. Package Contents
Verify that all components are present in the package:
- OSRAM BATTERYcharge 904 Unit
- Battery Clamps (Red and Black)
- Ring Terminal Connectors

4. Product Features
The OSRAM BATTERYcharge 904 offers a range of features for effective battery charging and maintenance:
- Intelligent Multi-Stage Charging: Features a 7-stage charging cycle for Lithium batteries and a 9-stage cycle for lead/AGM batteries, optimized for efficient and safe charging.
- Automatic Maintenance Mode: Automatically switches to a long-term maintenance mode once the battery is fully charged, preventing overcharging and ensuring battery readiness.
- Digital Display: An integrated digital display provides clear information on the charging process and battery status.
- Safety Protections: Includes reverse polarity protection and short-circuit protection for enhanced user safety and device longevity.
- Start/Stop Compatibility: Suitable for vehicles equipped with Start/Stop systems.
- Winter Mode: Protects batteries and optimizes charging performance in cold temperatures.

5. Setup
Follow these steps to set up your OSRAM BATTERYcharge 904:
- Prepare the Battery: Ensure the battery terminals are clean and free of corrosion. If necessary, clean them with a wire brush and a mixture of baking soda and water.
- Connect to Battery:
- Connect the red positive (+) clamp or ring terminal to the positive (+) battery terminal.
- Connect the black negative (-) clamp or ring terminal to the negative (-) battery terminal.
- For vehicle batteries, if connecting to the chassis, connect the black clamp to a metal part of the vehicle chassis away from the battery and fuel line.
- Connect to Power: Plug the charger's AC power cord into a standard electrical outlet. The charger will power on and perform a self-test.
- Select Mode: Use the 'MODE' button on the charger to select the appropriate charging program for your battery type (e.g., 6V, 12V, Lithium, AGM, Winter). The digital display will show the selected mode and battery voltage.
6. Operating Instructions
Once set up, the OSRAM BATTERYcharge 904 operates largely automatically:
- Initial Check: After connecting to power and selecting the mode, the charger will analyze the battery's condition. The digital display will show the current battery voltage.
- Charging Process: The charger will automatically begin the appropriate multi-stage charging cycle. The display will indicate the charging status and voltage.
- Monitoring: Periodically check the charger's display for status updates. The charger will progress through its stages, optimizing the charge for your battery.
- Maintenance Mode: Once the battery reaches full charge, the charger will automatically switch to a long-term maintenance mode. This mode keeps the battery at an optimal charge level without overcharging, making it suitable for extended periods of connection.
- Disconnecting: To disconnect the charger, first unplug the AC power cord from the electrical outlet. Then, disconnect the black negative (-) clamp/terminal, followed by the red positive (+) clamp/terminal.


7. Maintenance
Proper maintenance ensures the longevity of your OSRAM BATTERYcharge 904 and the batteries it services:
- Cleaning: Disconnect the charger from power and the battery before cleaning. Wipe the casing with a soft, dry cloth. Do not use harsh chemicals or abrasives.
- Cable Inspection: Regularly inspect the charging cables and clamps for any signs of damage, fraying, or corrosion. Replace if necessary.
- Storage: Store the charger in a cool, dry place when not in use. Ensure cables are neatly coiled to prevent damage. The integrated hook on the back of the unit can be used for convenient storage.
- Battery Care: For optimal battery life, ensure batteries are regularly charged and maintained, especially during periods of inactivity.

8. Troubleshooting
If you encounter issues with your OSRAM BATTERYcharge 904, refer to the following table:
| Problem | Possible Cause | Solution |
|---|---|---|
| Charger does not power on | No AC power; Faulty outlet; Damaged power cord. | Check AC power connection. Test outlet with another device. Inspect power cord for damage. |
| Charger displays "ERROR 1" | Incorrect battery connection (reverse polarity); Short circuit; Battery voltage too low for charging. | Disconnect charger, verify correct positive (+) and negative (-) connections. Ensure clamps are not touching. If connections are correct, the battery might be too deeply discharged to be recognized; try a different battery or consult a professional. |
| Battery not charging | Incorrect mode selected; Severely sulfated battery; Damaged battery. | Ensure the correct charging mode is selected for your battery type. The charger may not be able to recover severely damaged or sulfated batteries. Have the battery tested by a professional. |
| Charger gets warm | Normal operation during charging. | Some warmth is normal. Ensure adequate ventilation around the charger. If it becomes excessively hot or emits smoke/odor, disconnect immediately and contact support. |
9. Specifications
| Specification | Value |
|---|---|
| Brand | OSRAM |
| Model | OEBCS904 |
| Product Dimensions | 8.5 x 5.3 x 14.6 cm |
| Product Weight | 500 g |
| Output Voltage | 6V / 12V |
| Rated Current | 4 Amperes |
| Input Voltage | 12 Volts (AC power input not specified, but implied by 'Corded Electric') |
| Power Source | Corded Electric |
| Battery Types Supported | Lead-acid, AGM, Lithium |
| Charging Cycles | 7-stage (Lithium), 9-stage (Lead/AGM) |
| Safety Compliance | CE |
10. Warranty and Support
The OSRAM BATTERYcharge 904 comes with a 2-year guarantee, as indicated on the product packaging. For specific warranty terms and conditions, please refer to the documentation included with your product or visit the official OSRAM website.
Spare parts availability in the EU is guaranteed for 1 year. For technical support, service, or warranty claims, please contact your retailer or the official OSRAM customer service channels.







