Wiktor Wise
Braun electric toothbrush batteries can be replaced, and it's not a complicated process. The first step is to identify the type of toothbrush you have. Braun Oral-B has used various marketing and model names over the years, so it's important to look for the type number, which is marked on the bottom of the toothbrush handle. Once you know the type number, you can follow a detailed guide to dismantle the toothbrush and replace the battery. This usually involves desoldering and resoldering the PCB (printed circuit board) and removing the old battery. It is important to note that you should use a battery with the same chemistry as the original (NiMh, NiCd, etc.) so that the charger works properly. With a longer battery, you can increase the electrical capacity and prolong the time between recharges.
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What You'll Learn
Dismantling the Braun Electric Toothbrush
Firstly, identify the type of toothbrush you have. Braun Oral-B has used various marketing and model names over the years, so the type number, found on the bottom of the toothbrush handle, is the most reliable way to identify your toothbrush.
Now, to begin dismantling, place a small adjustable spanner around the flat white plastic part of the toothbrush and twist it anticlockwise. After twisting about 30 degrees, the white plastic should disengage from the main body. Take care not to lose the spring at the bottom of the mechanism (inside the copper coil). Once released, the inner mechanism should slide out easily.
Set aside the main body and the spring, as these won't be needed until reassembly. The mechanism contains the PCB (Printed Circuit Board), which controls the charging of the cell (battery) and drives the motor. De-solder the four tabs that hold the PCB and cell in position. Two tabs go to the motor, while the other two connect to the positive and negative sides of the cell. The negative tab on the cell needs to be bent up to enable the PCB's removal. Once this is done, the PCB can be lifted away, and the cell can be slid out of the body of the mechanism.
Now, you can measure your battery and decide whether to replace it with one of the same dimensions or modify the plastic housing to accept a longer, higher-capacity battery.
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Removing the old battery
Firstly, identify the type of Braun electric toothbrush you have. Braun Oral-B has various model names, including Professional Care, Genius, Smart, Pro, and TriZone. The type number of your toothbrush is marked on the bottom of the handle. It is important to identify your toothbrush model to ensure you follow the correct replacement procedure.
Once you have identified your toothbrush model, gather the necessary tools. You may need a small adjustable spanner, a soldering iron, and a desoldering braid or pump. These tools will help you remove the old battery and any attached components.
Now, let's begin the process of removing the old battery:
- Using the small adjustable spanner, place it around the flat white plastic part of the toothbrush. Twist the spanner anticlockwise until the white plastic disengages from the main body of the toothbrush. This will allow you to access the inner mechanism.
- Carefully slide out the inner mechanism, being mindful not to lose the spring at the bottom inside the copper coil. Set aside the main body and the spring, as we will need these later during reassembly.
- Examine the inner mechanism. You will see the PCB (Printed Circuit Board), which controls the charging and drives the motor. It has a momentary push button near the top.
- De-solder the four tabs that hold the PCB and the cell (battery) in position. Two tabs are connected to the motor, while the other two tabs are connected to the positive and negative ends of the cell.
- Pay close attention to the negative tab on the cell. It needs to be bent upwards to allow for the removal of the PCB. Once the tabs are de-soldered, carefully lift the PCB away from the mechanism.
- With the PCB removed, you can now access the cell (battery). Simply slide it out of the body of the mechanism. Take note of the battery's dimensions and any markings, such as "600," which may indicate its capacity.
- At this point, you have successfully removed the old battery from your Braun electric toothbrush. You can now clean the components, inspect them for any damage, or prepare to install a new battery.
Remember to handle the toothbrush carefully and follow the specific instructions for your toothbrush model. With careful execution and attention to detail, you can successfully remove the old battery and extend the lifespan of your Braun electric toothbrush.
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Soldering and de-soldering
To begin, carefully extract the inner workings of the toothbrush by pushing the shaft in from the top. Remove the power switch plate by carefully unclipping it from both sides. Now, it's time to start desoldering. Warm up your soldering iron and use it along with a desoldering pump or braid to carefully desolder the battery terminals on the circuit board. Start with the negative terminal, and be careful not to apply too much heat to avoid damaging the toothbrush. Bend the metal tabs upright and away from the board with a knife, ensuring no solder is left joining the solder tag to the board.
For the Braun Oral-B Vitality Type 3709 toothbrush, there are three terminals to desolder. Similarly, bend the tabs upright using a knife, ensuring the circuit board can be removed later. For the Braun Oral-B Professional Care Type 3728, after removing the power switch plate, use the soldering iron and desoldering pump to carefully desolder the positive terminal solder tag, followed by the negative terminal, from the circuit board. Again, bend the metal tabs upright and away from the board with a knife.
When installing the new battery, ensure the solder tags are trimmed to a similar length as the old battery. The leads attached to the replacement battery are typically longer than needed, so you can trim them after soldering. Be mindful to allow the positive lead to connect to the board without interfering with the spring. With the spring at the base inserted into the coil, slide the assembly back into the body, ensuring the switch on the PCB aligns with the button molding on the case. Press the parts together firmly until they snap into place.
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Reassembling the toothbrush
Now that you have successfully replaced the Braun electric toothbrush's battery, it's time to reassemble the toothbrush. Here is a detailed guide to help you through the process:
Step 1:
Place the spring at the base of the toothbrush into the coil. Ensure that the spring is securely inserted before proceeding.
Step 2:
Slide the assembly back into the main body of the toothbrush. Make sure that the parts are correctly aligned. Check that the switch on the PCB (Printed Circuit Board) lines up with the button molding on the outside of the case.
Step 3:
Firmly press the two parts together. They should snap together securely. If done correctly, your toothbrush should now be physically reassembled.
Step 4:
Place the toothbrush on its charging cradle momentarily to re-energize the internal chip. This step may not always be necessary, but it can help ensure that your toothbrush functions properly after reassembly.
Post-Reassembly Tips:
- If your toothbrush doesn't work initially, don't panic. Try placing it on the charging cradle, as mentioned above.
- Consider using a temperature-controlled soldering station for electronics repair. This can help prevent overheating and potential damage to the PCB.
- After soldering, use a magnifying glass to inspect for any solder splashes or balls that could cause future issues.
- If you plan to replace the battery again in the future, consider using desoldering braid instead of a desolder pump to be kinder to the circuit board.
By following these steps and tips, you should now have a fully functional Braun electric toothbrush with a new battery. Enjoy your refreshed oral care routine!
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Charging the toothbrush
Once you have identified your toothbrush model, follow the specific instructions for dismantling and replacing the battery. This may involve using a soldering iron to de-solder and re-solder the battery connections. Ensure you are confident in your ability to do this before proceeding.
After successfully replacing the battery, you can begin charging your toothbrush. Place the toothbrush on its charging cradle and allow it to charge fully. This may take several hours. You may also consider using a 5V USB phone charger to charge your toothbrush, although this method may not be as effective.
Once fully charged, your toothbrush should now be ready for use. Test it out by turning it on and ensuring it functions correctly. If it does not work, check that the internal chip has been re-energized by placing it back on the charging cradle momentarily.
With these steps, you can ensure your Braun electric toothbrush is charged and ready for optimal oral hygiene.
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Frequently asked questions
First, identify the type of toothbrush you have. Then, follow a detailed step-by-step guide for dismantling and replacing the battery. You may need tools like a small adjustable spanner and a soldering iron.
Dismantling involves unscrewing or twisting the toothbrush to access the inner mechanism and battery. You may need to de-solder components and remove the PCB (Printed Circuit Board).
You can use a standard AA rechargeable battery, ensuring it has the same chemistry (NiMh, NiCd, etc.) as the original battery. Alternatively, you can opt for a longer, higher-capacity battery by modifying the plastic housing.
Yes, websites like Instructables and ToothbrushBattery.com offer detailed guides, video tutorials, and tips for replacing batteries in specific models of Braun electric toothbrushes.
