1. Product Overview
The Bosch CORE18V 4 Ah Advanced Power Battery is a compact lithium-ion battery designed to deliver high power in a lightweight solution. It is suitable for standard to medium-duty applications, including drilling into concrete, metal, and wood, metal grinding, cutting, and light-duty chipping. This battery offers enhanced runtime and power compared to previous 18V 2 Ah models.
Key Features:
- Lightweight Design: Provides power without excessive weight, enhancing tool maneuverability.
- Enhanced Power and Runtime: Delivers twice the runtime and 60% more power compared to the BAT612 18V 2 Ah battery.
- High-Power Lithium-Ion Cells: Features a single layer of advanced 21700 cells for superior battery efficiency.
- Cutting-Edge Battery Design: Incorporates copper end plates, power rails, and a flexible circuit board to reduce resistance and increase efficiency.
- CoolPack 2.0 Technology: Bosch-exclusive technology that cools the battery faster, contributing to a longer battery lifetime compared to non-CoolPack Bosch 18V batteries.
- High-Resolution Charge-Status Indicator: Provides clear visibility of the remaining battery charge.
- Broad Compatibility: Engineered for 18V tools and chargers and is part of the AMPShare System, ensuring multi-brand compatibility with a growing list of cordless products.

Figure 1: The BOSCH GBA18V40 18V CORE18V Lithium-Ion 4 Ah Advanced Power Battery.

Figure 2: Diagram highlighting the key features of the CORE18V battery, including high-power cells, CoolPack 2.0 technology, cutting-edge design, and AMPShare compatibility.
2. Setup
2.1 Initial Charging
Before first use, fully charge the battery using a compatible Bosch 18V charger. The battery is equipped with a high-resolution charge-status indicator to monitor the charging progress.
- Connect the charger to a power outlet.
- Slide the GBA18V40 battery onto the charger until it clicks into place.
- Observe the charge indicator lights on the battery or charger. A full charge is indicated when all lights are solid.
- Once fully charged, remove the battery from the charger.

Figure 3: Two CORE18V batteries correctly seated on a compatible Bosch charger for charging.
2.2 Inserting the Battery into a Tool
Ensure the battery is fully charged before inserting it into your Bosch 18V compatible power tool.
- Align the battery with the battery slot on the power tool.
- Slide the battery firmly into the tool until it locks securely in place. You should hear a click.
- To remove the battery, press the release button(s) on the battery and slide it out of the tool.
3. Operating Instructions
3.1 Checking Battery Charge Status
The GBA18V40 battery features a high-resolution charge-status indicator. Press the button on the battery to view the charge level. The number of illuminated bars indicates the remaining charge.

Figure 4: The charge indicator on the BOSCH CORE18V battery, showing multiple illuminated bars for remaining charge.
3.2 General Usage Guidelines
- Always use the correct battery for your tool. The GBA18V40 is compatible with Bosch 18V tools and AMPShare System products.
- Avoid completely draining the battery to prolong its lifespan. Recharge when the charge indicator shows low levels.
- Do not expose the battery to extreme temperatures, direct sunlight, or moisture.
- If the battery becomes excessively hot during use, allow it to cool down before recharging or continued use.
4. Maintenance
4.1 Cleaning and Storage
- Keep the battery terminals clean and free from dirt or debris. Use a dry cloth to wipe them if necessary.
- Store the battery in a cool, dry place away from direct sunlight and extreme temperatures.
- For long-term storage, it is recommended to store Lithium-Ion batteries with a partial charge (around 50%).
4.2 Battery Lifespan
The CoolPack 2.0 technology helps extend the battery's lifetime by efficiently dissipating heat. Proper charging and storage practices will further contribute to maximizing the battery's overall lifespan.
5. Troubleshooting
5.1 Common Issues and Solutions
| Issue | Possible Cause | Solution |
|---|---|---|
| Battery not charging | Charger not plugged in, faulty charger, battery too hot/cold, dirty terminals. | Ensure charger is connected. Check charger for damage. Allow battery to reach room temperature. Clean battery terminals. |
| Tool not operating with battery | Battery not fully inserted, battery discharged, tool malfunction. | Ensure battery is securely clicked into place. Check battery charge level and recharge if necessary. Test with another charged battery if available. |
| Reduced runtime | Battery aging, extreme operating conditions, heavy load. | Battery capacity naturally decreases over time. Avoid continuous heavy loads. Ensure proper cooling during use. |
5.2 Official Product Videos
BOSCH GAL18V-160C 18V Lithium-Ion 16 Amp Battery Turbo Charger
This video demonstrates the features and operation of the BOSCH GAL18V-160C Turbo Charger, which is compatible with the GBA18V40 battery. It highlights the fast charging capabilities and design of the charger.
18V CORE18V Lithium-Ion 8 Ah High Power Battery
This video provides an overview of the 18V CORE18V Lithium-Ion 8 Ah High Power Battery, showcasing its design and power delivery within the Bosch 18V system, similar to the 4 Ah model.
6. Specifications
| Feature | Detail |
|---|---|
| Brand | Bosch |
| Model Number | GBA18V40 |
| Voltage | 18 Volts |
| Battery Capacity | 4 Amp Hours |
| Battery Cell Type | Lithium Ion |
| Item Weight | 1.15 pounds |
| Product Dimensions | 1.85 x 3 x 4.6 inches |
| Included Components | (1) CORE18V 18V Lithium-Ion 4.0 Ah Compact Battery |
| Recommended Uses | Power Tool |
7. Warranty and Support
Bosch 18V batteries are covered by a three-year limited warranty. For detailed information regarding warranty terms and conditions, please refer to the manufacturer's official website or contact Bosch customer support.

Figure 5: Visual representation of the BOSCH 18V 3 Year Limited Warranty. Effective 6/1/23, all 18V products are covered by this updated warranty.
For further assistance, technical support, or to register your product, please visit the official Bosch website or contact their customer service department. You can find more information on the BOSCH Store.





