How to replace the battery of any electric toothbrush – What manufacturers don’t tell you

If you read user comments in forums you will often find complaints that the batteries of powered toothbrushes do not last long. There seems to be an average life span of 2 -3 years. After that time, it will hold less charge and sooner or later refuse to charge altogether. Very it happens just when the warranty is over. So what to do? Buy a new handle?

Although manufacturers don’t tell you, you can change the batteries. It might need some research and tools, but it is definitely possible.

DIY battery replacement is not as difficult as it sounds. You just need the right kind of batteries and a soldering iron. Some experience might help but if you are careful and double check if you got the polarity right, you should be fine.

The steps are the same for every type of electric toothbrush.

First remove the brush head and open your toothbrush by removing the bottom cap. Don’t loose the spring under the cap and don’t damage the wire that connects the cap with the toothbrush.

Now carefully push the metal part that usually holds the brush head until the old battery comes out. The battery is connected by wire to a small circuit board. Cut the wire off as close as possible to the old battery. This is the point where you will attach the new battery later.

Take your two batteries and solder them together. When you do that, take care that the batteries don’t get too hot or you might destroy them. Combine the positive pole of the first battery with the negative one of the second battery.

Use tape to wrap the batteries until all metal parts are covered and you have one big battery with solder tails sticking out at each end. Now bend the two tail towards one end.

Check the polarity and solder the two ends to the circuit board. Insert the battery, put the cap with the spring back and turn on your toothbrush to check if it works.

What you need:

  • Soldering iron
  • wire cutter
  • tape
  • 2 rechargeable batteries

If you can not find new batteries locally, try online stores like Ionic industries.

Besides a wide range of batteries they also have detailed video guides on how to replace the battery for various toothbrush handles. This might be really helpful, because the trickiest part is opening the handle with breaking it.

Toothbrush HQ