- Free repair help and information Click here to ask a question Click here to see all categories Click here for info about Search
Search for free repair help & advice
Find: - Ask your question

Can you answer the question on this page?

Complete the Add Answer Form at the bottom of this page.

Follow the arrows


To select a different
category select from
the list below ...

  • Related Categories
  • All Categories
Audio Systems
Cassette Players
CD Players
In-Car Cassette/Radios
In-Car CD/Radios
Minidisc Players
MP3 Players

Bathroom Appliances
Baths and Showers
Electric Toothbrushes
Hair Straighteners

Sailing Dinghies

Chinaware and Porcelain

Digital Cameras
Film Cameras
Video Cameras

Clocks and Watches
Alarm Clocks
Wall Clocks
Wrist Watches

Jackets and Suits

Desktop PCs
Internet Connection
Notebooks/Laptop PCs
Tablet PCs
Virus Removal

Portable Air Conditioners

D.I.Y Tools
General D.I.Y
Switches and Sockets
Windows and Doors

Laminate Flooring

Cabinets and Cupboards
Garden Furniture
Kitchen Units

Garden Tools
Grass Trimmers
Hedge Trimmers
Irrigation Systems
Lawn Mowers

Convector Heaters
Fan Heaters
Home Heating Systems
Oil Filled Radiators

Household Appliances
Carpet Cleaners
Knitting Machines
Sewing Machines
Steam Cleaners
Steam Irons
Tumble Dryers
Vacuum Cleaners
Washing Machines

Kitchen Appliances
Coffee Machines
Cooker Hoods
Electric Cookers
Electric Kettles
Food Processors
Gas Cookers
Waste Disposal Units

Leisure Equipment
Camping Equipment
Fishing Gear
Gym/Fitness Equipment
Skiing Gear
Sports Equipment

CompactFlash (CF)
MultiMedia Cards (MMC)
Secure Digital (SD)
SmartMedia (SSFDC)
USB Pen Drives

Musical Instruments

Satellite Navigation

Office Appliances
Cash Registers
Document Laminators
Document Shredders
Fax Machines

Power Tools
Angle Grinders
Circular Saws
Electric Screwdrivers

Security Systems
Car Alarm Systems
Home Alarm Systems

Application Development
FTP Servers
Graphic Design
Instant Messaging
Internet Browsers
Media Players
Operating Systems
Web Servers
Web Site Design
Word Processors

Answering Machines
Corded Phone
Cordless Phone
Mobile Phone
VOIP Phones

Games Consoles

Caravans / Motorhomes
Mobile Homes

Cassette Recorders
DTT Receivers
DVD Players
DVD Recorders
Film Projectors
HD Televisions
MP4 Players
Portable Televisions
Satellite Receivers
Standard Televisions
Video Projectors
Widescreen Televisions

Vehicles, Motorcycles - fix/mend/repair/service information
Leisure Equipment, Sports Equipment - fix/mend/repair/service information
Fix It Yourself

Want to find out how to fix something? has thousands of pages of information to help you to do repairs yourself.

To ask how to fix it click here.

Heating, Home Heating Systems - fix/mend/repair/service information
Audio, Minidisc Players - fix/mend/repair/service information
Find A Fix

The easiest way to find a fix is to search

Click here to search.

A Free Fix? Really?

We can't actually do the repair for you, but we can help you with the information you need. is free so why not ask a question?

Click here to ask a question.

Furniture, Garden Furniture - fix/mend/repair/service information
Kitchen Appliances, Refrigerators - fix/mend/repair/service information
What do you need to fix? is organised into categories to help you browse for the repair information you need.

For example:
 Fix - Cars
 Fix - Lawn Mowers
 Fix - Printers
 Fix - Refrigerators
 Fix - Washing Machines

Click here to see all categories.
Over 39,000 pages of free repair advice > Bathroom Appliances, Electric Toothbrushes > Question
Bathroom Appliances, Electric Toothbrushes

bathroom appliances, electric toothbrushes, toothbrushes, teeth, tooth, battery, head, rechargeable 26 other questions

 Search     Ask question

Can I replace the battery in my Braun electric toothbrush?

Can i replace the battery a Braun electric toothbrush?

These look like sealed units and probably have to be waterproof.

Paul     September 2007
 Click here if you can answer this question 

Yes, if you're handy with a soldering iron!
The first trick is to get it apart to see what size battery is in there - see YouTube for some great videos.
Then, once it's open, measure the cell and buy one that matches the size with soldering tabs on the ends e.g. the ones stocked at
Then when it arrives simply solder the new one in!

Nevan Desmond     January 2014

There is an excellent article at:

The replacement batteries are available at:

Bosco     March 2013
I have a Braun 3D Excel and it has four wires coming from the bottom coil to the circuit board. One of these wires is broken/disconnected. I don’t know if this happened while I was taking it apart or was this way from before. Will the toothbrush still work with the three wires after I replace the battery?

Steve     January 2013
I have a Bruan 3D Excel. I took out the battery and it is a single piece about 4cm long. Can anyone tell me what battery I need to buy? Is it 4/5A or 2/3A? How many mAh? How many volts?

Steve     January 2013
I've had a Braun rechargeable toothbrush, (model 4730, I think?) since 1999. It's only now failed, after 12 years of working perfectly, which shows just how good Braun products and German engineering really is.

However, I have been careful with it - always holding the metal brush-holder/spindle downwards under the tap, so that water never leaked up through the plastic body/housing and into the electrics - and this has clearly paid off. I usually dry the case with a towel before putting it back onto the charger base.

I'll try dismantling the unit tonight, following instructions given by others on this Web site. I didn't realise you had to push the metal spindle down towards the body/plastic casing whilst turning the plastic base anti-clockwise. No wonder I couldn't get it open before!

Rancho Mirage     April 2011
Can someone tell me how to remove the guts from the Braun type 4730 toothbrush.. I think I have seen this somewhere but cant find it... I want to replace its battery. Thanks

BigJim1     January 2011
Update 2 to my previous answer:
The new Ni-Mh battery works OK, but it's a bit temperamental about charging. I think this is because the battery is less compatible with the charging circuitry than the original type which was Ni-Cd.
So - I've just ordered a new Ni-Cd type of battery to do another replacement! In the UK these are available from a company called Cell Pack Solutions - and doubtless other outlets too.

Ian     September 2010
HI there,
I have posted 2 videos on my blog site which show you how to change a battery on a Oral B Triumph electric toothbrush.

hope this helps..

nobblynoel     August 2010
Just to update my previous answer.

The new battery lasted 12 days on its first charge (using it for about 2 and a half minutes per day) - a bit less than expected, especially given the higher capacity of the new battery. This may be something to do with the different type of battery. Perhaps it's not being charged fully - or it's being overcharged (NiMh types have a lower voltage falloff upon full charge which may not be detected properly by the charging circuit until it's lost quite a lot of its charge.) I might try just charging it for 12 hours say, rather than waiting until the light stops flashing. This should extend the battery life because most chargers overcharge in order to detect the consequent voltage falloff which is how they detect that charging is completed.

Even so, it's a very cost effective repair and it's no problem for me to use a once-a-week charging regime which should give many more years of service.

Hope this helps someone.

Ian     April 2010
The battery types seem to vary between the different Braun models - my answer relates to the Braun Sonic Complete. Usual problem - after years of good service the ni-cd battery isn't holding its charge.

To get in to the unit - place a suitable object in to the recharging hole in the base and turn a quarter turn. There's a stub on the back of the charging stand for precisely this purpose. Very gently remove the innards by pushing down on the metal brush shaft - this pushes everything out through the base. Be very careful of the thin wires from the main circuit board to the base of the unit.

Having extracted the innards you'll need to desolder the battery. The negative terminal is closest to the base of the unit, the positive is closest to the middle - this is quite difficult soldering. First desolder the positive terminal from the circuit board using desoldering tape or a desoldering pump. Then bend the metal tag up to allow it to pass back through the board. Pull it out by pulling out the battery (still attached at the negative end).

The negative battery tag is soldered to the board under some other connections, making it very hard to get to. So, bend the battery upwards and cut through the nagative tag as close to the battery as possible (use wire cutters) - this leaves you something to solder the new battery to, and means you don't have to unsolder the hard-to-get-to solder point on the board.

The battery is actually two 2/3A (pronounced two-thirds A) size cells soldered together. If you cut off the outer plastic coating from the old battery you'll see that it's actually 2 cells. You'll need to buy 2 of these (the tagged type) - they're 1.2v - I bought NiMh ones. It's not always possible to replace NiCd with NiMh but they seem to work fine here. My replacements were 1500mAh which is a greater capacity than the stock parts - so should last longer between charges. Don't worry too much about the capacity - it's not critical - 750mAh or above will be fine. You can pick these up on ebay - they're typically used in things like remote control models. You need to buy the individual cells (two of them) not the ready made battery packs.

The positive end of the cells usually have a groove round the body.

Solder the two new cells together (positive of one to the negative of the other) by butting the cells together and soldering their tags. Fold soldered tags flush to cells. Now solder this new battery in to place. It's really hard to shape the +ve tag to the required shape and solder it in place - so I used a piece of wire on the positive end as follows: Solder a suitable piece of wire through the +ve hole in the circuit board. Fit the battery in place with the +ve tag sticking out towards you, and solder the battery tag to the other end of the wire. Trim and fold down neatly.

Then solder the negative battery tag to the remains of the tag you cut through when you removed the old battery.

You'll probably notice some moisture in the unit when you open it up - the seals start to fail after a while. Make sure everything is dried out before reassembly. You can spray the entire innards with WD-40 or similar if you like, but try to keep it away from the rubber o-rings. If you want to grease the o-rings you should use proper silicone grease - ordinary oil based lubricants are likely to attack the rubber.

Reassemble the unit and attempt to charge. If it appears totally dead you may need to jump start the battery. Temporarily wire the old battery (with a little charge in it) in parallel with the new one and charge for a few minutes to get some juice in to the new battery. I'm not sure if the charging circuit needs a little battery charge to be present in order to work, but I had to follow this procedure.

My unit took 21 hours for its first charge - longer than before because of the higher capacity battery - and the unit detects full charge OK despite being a NiMh battery.

You really need to be fairly good at soldering and especially unsoldering to attempt this. But if you're patient and careful, it should work OK.

Ian     April 2010
Ours has been on constant charge & its still working after 10 years. It is never used away from our own bathroom and now wouldn't hold a charge for long enough.On holiday we resort to manual brushing. Judging by peoples experience we will buy a new unit.

Gus     March 2010
Question for Paul (or others for that matter): the battery on my Oral B Triumph Professional Care 9000 is starting to lose it's charge after about 5 - 7 days instead of the usual two weeks. I had a look at your photos and instructions which are great. Nice of you to take the time to do that! However, after getting the bottom off my toothbrush I soon realised that replacing the battery was beyond my technical capabilities. I contacted Braun and they say that you're not meant to replace the batteries. How ridiculous! More sales for them I guess.

Would anyone be willing to discuss an arrangement whereby they would replace the battery for me? I would obviously give payment for time/parts etc if the cost was agreeable. Thanks in advance.

Glynn     May 2009
Ref Wiz.Au's comments regarding fitting more powerful batteries, I'm not convinced that you can interchange NiCd and NiMh batteries. As I understand it they need two quite different charging regimes (I think one gets a constant voltage whilst the other is pulsed?) Hopefully someone who knows what they are doing will pass through here and be able to resolve that one for us.

Ref Chris R (March 09) Don't worry about breaking the fine wires to the inductive charging coil, they are easily fixed. See my Answer of Oct 08 for details.

Ed Vine     April 2009
I recommend "Replacing the NiMH battery in a Braun electric toothbrush" ( ). Very good description of how to do it, with pictures.
I've just replaced the battery in a Braun Oral-B 3D and the internals looked just like those in the article above.
The battery types can vary but mine was a single NiMH cell, size 4/5A size. These are 'industrial' size cells, not consumer AA, AAA,C etc. In the UK, you can buy an exact replacement for these at RS ( and Rapid ( About 5UKP, plus delivery.
Be warned the spring in the bottom of the toothbrush is very strong; be careful when undoing the bottom and don't let the bottom cap spring away from the body or you may break the very thing wires that connect to the charging coil.

ChrisR     March 2009
It seems like people might be talking about two or three different models here! I say this because I read people using only _1_ battery?? in some repairs.

For those people with a pack that looks like two small fat cells, they are size "2/3A", 1.2v NiCd cells, in series to produce 2.4V

If you want better batteries, go see your local electric radio control car toy shop. They will sell NiMH in up to 1400mAh, compared to the miserly 600mAh NiCd which Braun use as standard.     February 2009
I have managed to get tagged battery the same size, AAH, from Budget Batteries, Excellent service but costly postage.

Norman     January 2009

DANNY HIBBERT     January 2009
I did this last night and took pictures of the entire process:

Paul     January 2009
Replaced my battery yesterday. The exchanged battery was a 4/5AF which is slightly shorter, wider and more expensive than the AA battery. So I drilled the bottom of the charge "hole" out which gave enough room for a 2500 mAh AA battery. Once soldered I had to connect it to the charger to get it to work. This is my second succesfully converted toothbrush.

Ontop     December 2008
Have finally made the time to fit a new battery as promised and I'm pleased to report that the brush is now working fine.
I couldn't find a supply of decent quality batteries, so the one I've had to fit is a bit pants, but it still brushed my teeth morning and evening for a week before needing a recharge.
It was a 1.2v Ni-Cad for anyone in the same boat.
I managed to break both the wires to the inductive charging coil while re-assembling it, but this is easily rectified as a fresh bit of wire can be peeled off the coil quite easily. You will need to scrape or burn the insulating lacquer off the end of the wire before you will be able to solder it though. Holding the tip of the wire in the yellow bit of the flame of a normal gas lighter for a few seconds does this fine. Try not to remove the lacquer any further back than that, as you may cause a short circuit when it all goes back together. If in doubt, test it with a simple meter set to resistance.
I notice that the newer versions of this machine use NiMh batteries, so I can't be sure whether you will need 1.2v or larger cells.
I hope this is of use to someone.

Ed Vine.     October 2008
Have finally made the time to fit a new battery as promised and I'm pleased to report that the brush is now working fine.
I couldn't find a supply of decent quality batteries, so the one I've had to fit is a bit pants, but it still brushed my teeth morning and evening for a week before needing a recharge.
It was a 1.2v Ni-Cad for anyone in the same boat.
I managed to break both the wires to the inductive charging coil while re-assembling it, but this is easily rectified as a fresh bit of wire can be peeled off the coil quite easily. You will need to scrape or burn the insulating lacquer off the end of the wire before you will be able to solder it though. Holding the tip of the wire in the yellow bit of the flame of a normal gas lighter for a few seconds does this fine. Try not to remove the lacquer any further back than that, as you may cause a short circuit when it all goes back together. If in doubt, test it with a simple meter set to resistance.
I notice that the newer versions of this machine use NiMh batteries, so I can't be sure whether you will need 1.2v or larger cells.
I hope this is of use to someone.

Ed Vine.     October 2008
Victor, I'm in the same boat, but as I just found a new one going cheap this has become an amusing puzzle, so I can afford to get it wrong now. I've bought a 1.2v tagged ni-cad and will be fitting it when I get a chance, probably at the weekend, watch this space...

Ed Vine     October 2008
Hi, in trying to find replacement batteries for my shaver, the only battery supply is

Click the batteries pic. I am sure that if you look at the battery types you will find one that matches the Braun one. Regards Jonathan

Jonathan Garstin     October 2008
Actually, no of this answers the question I have. I have took apart the "behind" and got the battery out. It does not have any marking on there that tells me any info on the battery's identity. I have no idea what size and still have no confirmed answers about the voltage of the battery. I was thinking CA123A batteries. However, I just do not know for certain. Size doesnt look right.Could someone please assist with this? Thank you.

Victor     September 2008
I have just dismantled my old Braun AdvancePower brush. It's the basic single speed one with a simple mechanical switch and contains a single tagged AA. Problem is that there is no voltage marked on it, (it is showing about 0.8v fresh from the charger which is why it's now in bits!) I was all set to order a 1.2v replacement until i saw that CPC only supply 3.6v tagged AAs, no 1.2v ones at all... Apart from trying to measure the charger's output voltage, which will be difficult what with the airgap transformer and all, how can I tell what voltage the battery is? Apart from one diode protecting the charging loop there is no circuitry in the the thing at all, and the motor has no markings on it either... Any ideas anyone?

Ed Vine     September 2008
What's the voltage of the original battery? Is it a single cell 1.2V or a double cell 2.4V??

Edd     September 2008
I cut the base away a bit with a dremmel, drilled a hole where the +ve terminal fits, and threw away the spring, and now it fits a normal 2300mAh AA battery. Soldered wires to the terminals, so it isn't so fiddly to change over if I ever decide to do it again. Only the seal needed to be repaired - nothing else is damaged during replacement if you're careful. Thanks to Rob Kirke for the tip to jump-start it!

David     August 2008
Thanks to all who have replied to this I've just fitted a new battery (4/5ths AF size) to mine by following your instructions ...tho' the tags on the new one were a bit wider than the original so had to be filed to fit thru' the slots on the unit...and I applied PTFE (plumbers tape) around where the seal was's early days but will see how the seal holds out!!

Peegypops     August 2008
Yes you can but with a lot of difficulty and the process will damage the water sealant rubber gasket at the top of the unit making it prone to water leakage and damage. I used the method described by Richard G above and got as far as removal of the battery pack. Then I realised that there would be other damages during the battery replacement and considered it not worth while. Mine was an old one with not much battery life. Mine had lasted 2-3 years with continuous use. This must be my third Braun tooth brush and they are really great compared to philips and others in the market. If you are looking for a good electric tooth brush with replaceable rechargable battery (as if in a flash light) buy Krups.

Raj     June 2008
I just sucessfully replaced the battery in a Braun electric toothbrush - It's worked well for over a year serving two people, but had recently become a bit sluggish. All things considered this is a fairly decent lifetime for a NiCd battery - nearly 1500 shallow discharge-recharge cycles. It was replaced with a newer 2500mAh NiMH battery with tabs, which should work just as well in its place, and provide plenty of extra capacity for camping trips etc.

One strange thing I found was that after replacing the cell, there was no sign of life at all, until I 'jump started' the unit by briefly jumpering positive from the battery to the gate of the mosfet IC (the only lead not paralelled together on the largest IC near the motor end). After this the unit and timer worked properly. I wonder if this is a new attempt to make a "limited lifetime" appliance? I know the contollers in some laptop batteries will not fire up again once cell voltage has reached zero (i.e by replacing the cells).

Rob Kirke     June 2008
you can replace the batterey as follows:
1) if you have the charger unit, at the rear is a 'stub' which fits int the base of the toothbush-insert brush and turn a 1/4 to release the base
2) turn bush upside down and push on a firm service (this moves the battery out of the stem)
3) pull battery of out stem and unclip the battery holder
4) remove circuit board and remove/replace the battery
5) refitting is reversal

Richard G     April 2008
you can change the battery,but it will have to be soldered,
to open the unit you need to turn the base anticlockwise to unlock it, there are two cut-outs across it, use thin nosed pliers, then push it out from the top. take great care of the loose leads on the pick up coil in the base they should'nt break but make sure you don't trap them when you put it back together.
you must bear in mind the heat produced when soldering could damage circuit board!

steve     March 2008
With a big coinshape like tool you will be able to open de bottom off the machine. Turn it about 1/4 and pull to open. You will have to replace the batery with same one witch has tabs attached to it. The machanics of a Braun are such that it is worth to replace the battry only once. After that the toothbrush is mostly worn out mechanicly, water leaks in to it at the axle where you put up the brush itself. Sorry about my English but i'am Dutch.

Techman     October 2007
I can't answer the question but I've just bought my THIRD one. The first one packed up so I took it apart and there was no way I could get it back together (design?)
Ther are some very tricky wires- very fine. Now I've got another so I'm gonna have another look at no. 2
Even the new one has ni-cad (circa 1980 ! )batts. I'm sure Braun know exactly what they're doing.Let's see and maybe Braun will start putting batteries in that last more than a year.

Brauned Off     October 2007
Add answer to

Add your answer using the form below ...

The question: Can I replace the battery in my Braun electric toothbrush?
Your answer:

(Add your answer here. Try to include as much detail as possible.)
Your name:

(Enter your name as you wish it to be displayed.) > Bathroom Appliances, Electric Toothbrushes > Others

 Braun Oral-b Triumph V2? Boss therm bps42rf?
 Ford 8240? i have a 3d braun type 4736 toothbrush,can i replace the battery?
 Braun plak control 3d action? replacing battery?

26 other questions.


Information posted by users should be considered for general guidance only. Users act, or refrain from action, on the basis of such information entirely at their own risk. does not endorse any of the information supplied on this website by users.

See Small Print.

Home | Ask Question  | Contact Us
Attempting repairs can be dangerous.
Read this before using this website.
©  2005 vD