1. Introduction
This user manual provides important information for the safe and effective use of your Ferm AX-Power 20V 4.0Ah Lithium-ion rechargeable battery. Please read this manual carefully before using the battery and keep it for future reference.
The Ferm AX-Power 20V 4.0Ah battery is designed to provide reliable power for all compatible Ferm AX-Power 20V cordless tools, ensuring sufficient energy for various manual tasks.
2. Safety Instructions
Always observe the following safety precautions to prevent electric shock, fire, and serious injury.
2.1 General Battery Safety
- Do not disassemble, open, or shred battery pack.
- Do not short-circuit a battery pack. Do not store battery packs haphazardly in a box or drawer where they may short-circuit each other or be short-circuited by conductive materials.
- Do not expose battery pack to heat or fire. Avoid storage in direct sunlight.
- Do not subject battery pack to mechanical shock.
- In the event of battery leakage, do not allow the liquid to come into contact with the skin or eyes. If contact has been made, wash the affected area with copious amounts of water and seek medical advice.
- Do not use any charger other than that specifically provided for use with the equipment.
- Do not use any battery pack which is not designed for use with the equipment.
- Keep battery packs out of the reach of children.
- Seek medical advice immediately if a cell or battery has been swallowed.
- Keep battery pack clean and dry.
- Recharge only with the charger specified by Ferm.
- Do not leave a battery pack on charge when not in use.
- Do not store the battery in temperatures above 40°C (104°F).
- Dispose of properly. Do not dispose of battery packs in household waste.
3. Product Features
The Ferm AX-Power 20V 4.0Ah battery offers the following key features:
- High Capacity: 4.0 Amp-hour (Ah) for extended runtime.
- High Voltage: 20 Volts for powerful performance.
- Lithium-ion Technology: Provides fade-free power and longer battery life compared to traditional battery types.
- Rechargeable: Designed for multiple charge cycles.
- Compatibility: Fully compatible with all Ferm AX-Power 20V cordless tools.

Image 1: Front view of the Ferm AX-Power 20V 4.0Ah Lithium-ion rechargeable battery. This image shows the battery's black casing with red accents and the "AX POWER 20V 4.0Ah" branding clearly visible.

Image 2: Packaging of the Ferm AX-Power 20V 4.0Ah battery. The box displays the "AX POWER 4.0Ah" logo, an illustration of the battery, and text indicating "1 BATTERY 20V 4.0AH" and "COMPATIBLE WITH FERM - AX-POWER 20V MACHINES". It also highlights a "3 YEARS GUARANTEE".
4. Setup
4.1 Initial Charging
Before first use, the battery pack must be fully charged. Use only the original Ferm AX-Power 20V battery charger (sold separately) for charging.
- Connect the charger to a suitable power outlet.
- Slide the battery pack onto the charger until it clicks into place.
- The charger's indicator light will show the charging status. Refer to your charger's manual for specific light indications.
- Once fully charged, remove the battery pack from the charger.
A 4.0Ah battery typically takes approximately 60 minutes to fully charge with a compatible Ferm charger.
4.2 Attaching to a Tool
To attach the battery to a compatible Ferm AX-Power 20V tool:
- Align the battery pack with the battery port on the tool.
- Slide the battery pack firmly into the tool until you hear a click, indicating it is securely locked in place.
- Ensure the battery is fully seated before operating the tool.
5. Operating the Battery
The Ferm AX-Power 20V 4.0Ah battery is designed for seamless operation with Ferm AX-Power 20V cordless tools.
5.1 Battery Level Indicator
Some Ferm AX-Power tools or chargers may feature a battery level indicator. Consult your tool's or charger's manual for details on how to check the battery charge level.
5.2 Optimal Performance
For optimal performance and battery life:
- Avoid completely discharging the battery before recharging.
- Recharge the battery when its power noticeably decreases.
- Do not expose the battery to extreme temperatures during operation.
6. Maintenance
Proper maintenance will extend the life of your Ferm AX-Power battery.
6.1 Cleaning
- Keep the battery pack clean and free of dust and debris.
- Use a clean, dry cloth to wipe the battery terminals and casing.
- Do not use solvents or harsh chemicals to clean the battery.
6.2 Storage
- Store the battery pack in a cool, dry place, away from direct sunlight and moisture.
- For long-term storage, it is recommended to store the battery with a partial charge (around 50%).
- Do not store the battery in temperatures above 40°C (104°F) or below -20°C (-4°F).
- Remove the battery from the tool when not in use for extended periods.
6.3 Disposal
Lithium-ion batteries must be disposed of responsibly. Do not dispose of battery packs in household waste. Contact your local waste management authority for information on proper recycling or disposal options for Li-ion batteries.
7. Troubleshooting
If you experience issues with your Ferm AX-Power battery, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Battery not charging | Charger not plugged in; Battery not properly seated; Faulty charger; Battery too hot/cold. | Ensure charger is plugged in and receiving power. Re-seat the battery on the charger. Try another compatible charger if available. Allow battery to reach room temperature before charging. |
| Tool not operating with battery | Battery not fully charged; Battery not properly attached to tool; Faulty battery; Faulty tool. | Charge the battery fully. Ensure battery is securely clicked into the tool. Test with another known good battery if available. If the issue persists, the tool or battery may require service. |
| Reduced runtime | Battery not fully charged; Battery nearing end of life; Operating in extreme conditions. | Ensure battery is fully charged before use. Battery capacity naturally degrades over time. Avoid operating tools in very hot or cold environments. |
If the problem persists after trying these solutions, please contact Ferm customer support.
8. Specifications
- Model: CDA1155
- Battery Type: Lithium-ion
- Voltage: 20V
- Capacity: 4.0Ah (4000 mAh)
- Weight: Approximately 700 grams
- Compatible Devices: Ferm AX-Power 20V Cordless Tools (e.g., Akkuschrauber - Cordless Drill/Screwdriver)
- Recharge Time (approx.): 60 minutes (with compatible Ferm charger)
9. Warranty and Support
Ferm products are manufactured to high quality standards and are guaranteed for a period of 3 years from the date of original purchase. This warranty covers defects in materials and workmanship.
For warranty claims, technical support, or spare parts, please contact your local Ferm dealer or visit the official Ferm website. Please have your proof of purchase and the product model number (CDA1155) ready when contacting support.
For more information, visit: www.ferm.com





