how to replace 12v Ni-CD makita battery cells.

Introduction

In this tutorial, we will guide you through the process of replacing the cells in a 12V Ni-CD Makita battery pack. Many repair technicians avoid this task due to the lack of screws and the difficulty of opening the pack. However, with the right tools and steps, you can successfully replace the battery cells and extend the life of your Makita power tools.

Step 1: Gather Necessary Tools and Materials

Before starting the replacement process, ensure you have the following tools and materials ready:

• Replacement Ni-CD cells: Ensure they are compatible with your Makita battery pack.
• Screwdriver: To help pry open the battery pack.
• Utility knife: For cutting through any adhesive.
• Soldering iron: Needed to disconnect and reconnect the cells.
• Safety goggles: To protect your eyes during the process.
• Heat shrink tubing: To insulate connections after soldering.

Step 2: Open the Battery Pack

Opening the battery pack can be challenging due to its design. Follow these sub-steps:

1. Locate the seam: Identify where the two halves of the battery pack meet. This is often a tight fit.
2. Use the screwdriver: Gently insert the screwdriver into the seam and twist to create a gap.
3. Pry open carefully: Once you have a gap, use the screwdriver to carefully pry the two halves apart, taking care not to damage the internal components.

Step 3: Remove Old Battery Cells

Once the pack is open, you can remove the old cells:

1. Take note of connections: Before disconnecting the cells, take a photo or make a diagram showing how the cells are connected.
2. Desolder connections: Use the soldering iron to carefully desolder the connections from the old cells.
3. Remove cells: Gently remove the old cells from the battery pack. Be cautious of any remaining adhesive.

Step 4: Install New Battery Cells

Now it's time to install the new battery cells:

1. Insert new cells: Place the new cells in the same configuration as the old ones.
2. Solder connections: Using the soldering iron, solder the connections according to the diagram or photo you took earlier.
3. Insulate connections: Use heat shrink tubing to cover the soldered connections to prevent short circuits.

Step 5: Reassemble the Battery Pack

After replacing the cells, reassemble the battery pack:

1. Align the two halves: Carefully align the two halves of the battery pack.
2. Snap the pack shut: Press the two halves together firmly until they click into place.
3. Check for gaps: Ensure there are no gaps that may indicate the pack is not sealed properly.

Conclusion

You have successfully replaced the cells in your 12V Ni-CD Makita battery pack. This DIY repair can save you money and extend the life of your tools. Remember to handle all components with care and ensure proper insulation for safety. If you encounter any issues during the process, don't hesitate to consult additional resources or seek professional help. Happy repairing!