Why Your Braun Oral-B or Sonicare Toothbrush Is Not Charging

We are often contacted by customers whose Electric Toothbrush has stopped charging. A charging problem is quite common and can sometimes be mis-diagnosed as a faulty charger/faulty battery when the opposite is true. This can lead to frustration and people buying a whole new toothbrush when replacing a part is a cheaper alternative.


Below we run through how to tell if you have a faulty battery, a faulty charger or other problem with your electric toothbrush. This applies equally to Braun Oral-B, Philips Sonicare and Colgate Omron rechargeable toothbrushes.

Diagnosing Charging Problems


Is the Charger Working?

Firstly, is the charging light on your toothbrush lighting up or blinking as usual? If there is light activity when placing the brush on the charger then you can assume the charger is working and that the fault lies with the toothbrush itself – either with its internal circuitry or its battery. You can skip to the next section heading if the charging light is working normally.

If no lights come on when you put the brush on to charge, even after an hour on charge, has the charger and/or bottom of the toothbrush been getting slightly warm? In normal use the charger or toothbrush will be slightly warm to the touch after charging for a few hours. If there is no warmth check that the charger is plugged in to the wall socket firmly. If it is, also check the wall socket by plugging a lamp or other electrical item into the wall socket to verify that the socket is live and switched on. You can also try plugging the toothbrush charger into a different wall socket that is known to be working.

Assuming that the wall socket is live, if you have access to a spare charger via a friend, relative, colleague or neighbour then try putting your toothbrush on their charger. You can also try their toothbrush on your charger.

If you have now deduced that it is your charger at fault, head over to our Oral-B chargers page or Philips Sonicare chargers page to find a suitable replacement charger. Otherwise, continue below for help fixing the toothbrush itself.

Internal Toothbrush Fault

There are two main causes for charging faults inside the toothbrush, either damaged components for example from being dropped or from water seeping inside, or a failed battery.

If you have dropped your electric toothbrush or knocked it onto the floor then an internal solder connection might have cracked causing a bad connection. Upon opening the toothbrush handle carefully inspect the PCB and the solder connections to other parts of the toothbrush such as the motor, battery and charging coil. You can find guides to opening your toothbrush on our website. Any cracked solder joints can be repaired by reheating them with a soldering iron. The fine copper wires from the PCB to the induction coil in the bottom of the handle can easily break too.

Inspect the PCB for any evidence of water ingress such as corrosion, staining or crystal formation on either side of the PCB. Philips Sonicare brushes in particular have very fine tracks on the PCB which are easily damaged by corrosion.

Over the years the performance of your toothbrush’s internal rechargeable battery will gradually deteriorate. This means that you will get fewer brushing sessions out of a charge and will need to recharge the toothbrush more frequently. Once you find you are recharging the toothbrush too often it might be time for you to replace the battery in your toothbrush. We have published photographic guides for replacing the battery in various Philips Sonicare, Braun Oral-B and Colgate Omron toothbrushes in the Guides section of our website here, so take a look at replacing the battery in your toothbrush to restore it to full power again.


If you need to use a toothbrush repair service we have a dedicated page here to help you find a suitable solution.

31 thoughts on “Why Your Braun Oral-B or Sonicare Toothbrush Is Not Charging

  1. Good morning,
    My sonicare wasn’t charging. The light flashed a few times but and then stopped illuminating. Just replaced the battery and still no light. Any ideas? I’m in the UK. Do you do a repair service if I can’t find the problem?

    1. It sounds like there could be internal water damage to the circuitry on the PCB. What is the HX number marked on the bottom of your toothbrush handle?

  2. my sonicare is not holding a charge. The model number on the bottom of the toothbrush is HX6210-02 150504 3A. I always clean and wipe it after every brush. Thanks, Bart

    1. It could either be a failed battery or it could be water damage to the PCB inside the handle. Inspect the PCB by opening the toothbrush. The Sonicare HX6210 toothbrush should open up in a similar way to the DiamondClean model here.
      The battery needed for your HX6210 is available from our secure online shop here.

  3. I am on charger and brush # 2. In the last 6 months. Both brushes work perfect but… the chargers just keep dying. The last 1 i had for only 3 weeks before it just won’t charge either brush and it was charging both. I took it straight out of the box and it has sat on the same spot on my sink. It was only plugged in 1 time over night and that was the first night i got it. Other then that, only a couple hrs here and there as needed. What should i do?

    1. Can you take the charger back to where you bought it? Otherwise, make sure you buy a genuine Oral-B replacement. A used charger might be a better bet if you can only get third-party chargers where you are.

  4. After the battery is charged, the brush immediately discharges after 1s. Battery replacement did not help. After checking the old battery, it was found to be OK. What could be the problem.

    1. The problem could be the charger, or a break in the fine copper wires inside the toothbrush connecting the charging induction coil to the circuit board. There could also be water damage to the circuit board.

  5. I am in Goa in India and we had a problem with our electrics,a faulty plug caused a short across several appliances including my toothbrush charger.Do I have to replace the charger or can it be repaired,or can it damage the toothbrush itself which is still working

    1. Hi Keith, if the charger is no longer working then unfortunately they can’t be repaired internally as the circuitry is sealed in resin. Have an electrician check the mains AC plug and cable, and replace them if that is the issue.

  6. I bought Braun toothbrush and realised I had to buy a shaver adaptor too. I don’t have shaver socket in my bathroom so needed to plug it into a standard 3-pin UK wall socket using the adapter.

  7. Philips Sonicare – the 9xxx series. Stopped charging. Took apart, and didn’t see anything wrong with it. Placed it “naked” (out of it’s case) on the charge stand, and it started charging. When I then inserted just the bottom “plug” it rests in when in it’s case, and placed it back on the charger, it stopped charging. So on the charger, I removed the clear plastic holder, and placed the toothbrush, in it’s case, on the charger, and it started charging.

    Looks like the distance of the induction coil at the bottom of the brush into the electric field generated by the charger has all of a sudden made a difference – does this mean the battery needs changing? I otherwise can’t find anything wrong with the toothbrush. The same thing occurs when I use my wifes charger. And yet her toothbrush charges fine and doesn’t need to be closer to the base of the charger.

    Any ideas?

    1. The proximity thing could be a red herring. The real issue could be a loose connection/broken wire from the charging coil to the PCB (inside the brush).

  8. does anyone know what is the output voltage of the Braun 3731 wall adapter? i.e. which voltage runs on the cable from the wall adapter to the stand? The most likely cause for a non working charger is the wall adapter part, since the rest is just passive components. In principle, if the wall adapter role is to step down from – say – 220V 50 Hz to 12V 50Hz, then it is easy to replace it.

    1. I think the frequency is different, for the purpose of inductive coupling. Maybe in the order of kHz. You’ll probably need an oscilloscope to measure that!

  9. So helpful, thank you! Toothbrush is now working and my boyfriend is super impressed!

    Good tip about soaking the handle before trying to take it apart so that it opens more easily.

  10. My toothbrush charges and holds the charge but the light never turns green now. Does the battery need replacing?

    1. What is the type number marked on the toothbrush handle and how long does the battery last for after a 24 hour charge?

      1. The #3738 and it only lasts for 60 seconds and then needs to be recharged.

        1. Yes that sounds like it needs a new battery. See our Triumph v1 toothbrush repair guide here for details on how to open your type 3738 and measure the original battery.

  11. I encountered my second case of the same issue (as first case) recently. The same situation. A oralB 3000 toothbrush (with its own charger) and oralB 1000 (with it’s own charger). The battery for both toothbrushes are just fine. The issue is that these brushes will fully charge up when the battery is pretty-much drained (ie. toothbrush out of charge and no longer spinning).

    Once fully charged, I can use these toothbrushes as normal. But putting them back on the charger does not make them charge back up to full charge. Instead – even if the next day when we remove the toothbrush from the charger – we can only use the toothbrush for say a couple of days —- and the toothbrush will just run out of charge while in the middle of using it.

    At this point —— putting the toothbrush back on the charger for a long enough time will recharge the battery fully again. And then the same cycle repeats itself. I’m thinking there’s a reliability issue in the charging circuit (inside the toothbrush, not the charger itself) —– for example, one of those tiny surface mount components, such as a surface mount capacitor, has gone out of specs.

    The problem is —– the toothbrush works (somewhat). But a component has obviously failed in the charging control circuitry inside the toothbrush. I think this behaviour has been seen by you and other users before.

  12. My soniccare diamond clean toothbrush is not charging. What are my options?

    1. Hi Marjorie, When you say the DiamondClean brush is not charging, does the light come on when you put it on the charger? Does the light come on when you switch on the toothbrush? How long does it run for?

  13. After replacement of my Braun Triumph V2, type 3764, battery is no longer charging , coils is intact and good soldering joint .
    Any thought would be helpful?

    1. As well as checking the charger itself, run through the charge/discharge cycles to reset the battery meter as shown here.

  14. I just purchased the Oral-B 600 and started charging it yesterday. It’s been over 24 hours and the charging light is still blinking. What should I do please?

    1. If it’s still blinking after 48 hours see how many days you can use it for before it needs charging again. Then if it still doesn’t stop charging after 48 hours take it all back to the shop you bought it from as it’s faulty. The charging circuitry should shut off automatically once the battery is full. This normally happens after 12-24 hours.

  15. After charging my toothbrush, the red light started flashing again so I put back on the charger. Green light flashed for a while, then stopped. Used brush and red light flashed again. Now it has lost all charge. Used a different charger which made no difference. Do I need a new battery, a new toothbrush or a new charger?

    1. What is the make and type number/model number of your toothbrush?

  16. If the bottom of the toothbrush is warm, what is the issue? The lights on the toothbrush are not coming on.

    1. It sounds like a fault inside the toothbrush – either the circuitry or the battery.

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