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Repairing Other Models of Braun Oral-B Electric Toothbrush

Over the years here at Ionic Industries we’ve come across many different models of electric toothbrush, particularly from Braun Oral-B. These are some of the less common models we have seen that aren’t already covered in our toothbrush battery replacement guides section:

  • Vitality Sonic – Type 3737
  • Pulsonic Slim – Type 3716A
  • Pulsonic – Types 3722 and 3723
  • Advance Power – Type 4716
  • Philips Sonicare PowerUp – HX3110

Below are some hints on how to open these toothbrushes and replace their internal rechargeable batteries.

The Vitality Sonic can be opened by putting the brush on its charger and twisting it anti-clockwise a quarter of a turn. The base cap of the Advance Power 4716 also needs to be twisted but by using a flat metal bar between the notches in the rim of the base.

The Pulsonic models have a screw holding the base cap in place, and once the cap’s removed you can release the catches and slide the insides out. Be aware that the original Pulsonic models had Li-ion batteries rather than the lower voltage Ni-MH batteries used in the slim version.

With the Sonicare PowerUp insert a large flat-head screwdriver in the centre of the base cap and turn it anti-clockwise a quarter of a turn. You can then pry the cap out and release the clips holding the innards in place using a smaller flat-head screwdriver.

If you need further hints on changing the battery in these models or any others just ask us in the comments section below. Likewise, please tell us your tips and experiences with these brushes and other models!

21 thoughts on “Repairing Other Models of Braun Oral-B Electric Toothbrush

  1. I have a 3737 model without any kind of collar at the brush end. In other words, the mateal shaft emerges straight from the body/handle without passing through any external sleeve. I’ve remove the base but, other than pushing VERY, VERy hard on the end of the metal spindle I dont see how to get the innards out. Is there a trick?



    1. Hi Ed, with the Vitality Sonic there can be varnish around the shaft where it goes into the external collar. If you chip this varnish off you should be able to push the shaft into the housing.

    2. Indeed you are right! the only way to get it out is pushing very hard the tip of the metal shft. The way I used is to hammer the tip very gently so that it gradually sinks.

  2. Hello,

    I have a Philips Sonicare Flexcare HX6950 and would appreciate any guidance you have on swapping the battery.

    Thank you.

    1. The FlexCare models (HX6900 series) have very similar handle casing and internals to the EasyClean models so you can use our Sonicare EasyClean repair guide to replace the battery.

  3. I have a Braun Advance Power 4716 and the battery no longer holds a charge. I’ve got the battery out, it’s a Ni-Cd one, but no mAh marking. All it has is 430LH SAN.
    It is 49 x 14mm, with in-line tags. I can’t trace this battery at all online.
    On your ebay page you have a 700 mAh rechargeable battery, Ni-Cd, same dimensions suitable for a shaver. Not sure my question to you has got through on ebay, so I’m trying again here. Do you think this battery would be suitable as a replacement for my toothbrush please?
    I don’t want to swap to a Ni-Mh one in case the charger doesn’t work properly.
    Many thanks.

    1. Hi Susan, Yes if your original battery is a Ni-Cd battery you can replace it with one of our Ni-Cd replacement batteries with solder tags, of the same dimensions.

  4. Hi, I have a Philips Sonicare HX5350/02 on which the battery seems to be failing. Can you help me to work out how to replace it please? thanks.

    1. Hi Simon, Your CleanCare looks similar to the old Advance/Essence models. There are some instructions on opening these brushes here. We have Ni-Cd toothbrush batteries available here in our secure online shop.

  5. I have a Salton Ultrasonex Phaser toothbrush. Do you know how to change the battery?

    1. Hi Simon, that’s not one I’ve seen before. Checking for an Ultrasonex Phaser online it looks like it might come apart in the middle somehow – though if gently twisting it doesn’t seem to do anything I’m not sure what method to suggest!

  6. Hello,
    Any help replacing a Sonicare HX6210 battery would very much be appreciated.

    1. The HX6210 probably comes apart in the same way as opening the Sonicare DiamondClean toothbrush, i.e. by alternately squeezing the sides together, then the back-and-front together, to make the base cap pop out slightly. It looks like the Sonicare HX6200 series are fitted with Ni-MH batteries so a suitable replacement battery should be available in our secure online shop.

  7. Can the Rota-dent electric toothbrush battery be replaced? If so, What kind of battery? and is there a guide or how-to directions for DIY installation?

    1. Yes the battery in the Rotadent electric toothbrush can probably be replaced, but we have no instructions on how to open it to inspect the battery.

  8. I Have A Braun “ULTRA” Type 4-713 Electric Toothbrush,
    My question is there a replacement battery still available for it?

    1. Yes, many of the type 4713 Braun/Oral-B toothbrushes were fitted with a 56mm x 17mm 2.4V battery. If yours is too then see our Sonic Complete Toothbrush Battery for a potential replacement.

  9. I have an old BRAUN Plak Control Type 4726.
    Open it but the battery has no marks
    It’s an assembly of 2 cells
    this assembly is 56mm x 22mm
    Voltage mesurement : 0.6v (seems battery out of order).
    Trying to charge it (with an external charger), Max voltage 2.83V. I’m waiting for 1 hour.

    Where i can find this kind of batteries, i’m located in France.

    1. Bonjour Fred, yes the Type 4726 is very old!
      We sell a battery pack made of 2 cells for the Sonic Complete and some Plak Control models here. This should fit your toothbrush if you add a little padding around the battery. It is the correct voltage. Recharge it for 24 hours maximum.

  10. I have an Oral B Pulsonic (not the SLIM).
    Is there a replacement battery available?
    The original li-ion battery has 4,1 V and 530 mAh. Its dimensions are 43mm x 18mm.

    1. The original Pulsonic brushes (Type 3722) took a 43mm long, 14mm diameter Li-ion battery so you might find that your battery is 14mm diameter. Li-ion batteries used to be rated at their maximum voltage which is 4.1V or 4.2V. Nowadays they are rated using their average voltage which is 3.6V or 3.7V. Either of these is suitable for replacing your Pulsonic battery. They are not available with the studs on the ends but you can often fold up metal tags fitted to a battery into a concertina shape ( /\/\/\/ ) to give a good connection, or solder the tags to the contacts. This battery on eBay should be the correct size for your Pulsonic toothbrush.

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