Dissembled and noted the cam / linkage barely moved. Check the two joints where the batterys solder tags are soldered to the PCB. Could the gearbox be jammed with debris? Really useful guide to a straightforward battery change. I followed the instructions to thin the battery terminals and it just fit well. Thank you for your feedback Jan! Click on any picture to enlarge it. Also putting it on the charger had no effect. Some times I can only get one or two, 2 minute brushing sessions. What are the general best practices to do with this kind of battery? Thank you! Hello sir, i manage to change the battery to oral-b pro 500, and thank you for all these clear instruction butit seems the problem is not the battery but motor, after the replacement all works perfecty but motor power is week and sometime it stall, i measure the current and i think is very big about 1.6-1.9A But thats no problem, because they are placed where they have been and that should be no problem Thats when I would have to allow uninterrupted charging. Thanks for the tip Rick! The original-sized 42mm x 14mm batteries are 1200mAh capacity and the longer 49mm x 14mm batteries are 2200mAh, over 80% higher capacity! Brilliant instructions very clear have now done 2 toothbrushes both currently on charge. It is not so important for me to have the pressure light working, but okay, it would be complete with it. Many cycles of very hot water & lever gets the base safely free of the wand & gunk. Your Brush FAQ rattled the brain cell last used a lifetime ago sorting out Motorola walkytalky NiCad packs & poor capacity, memory effect. Over the years the motors can wear too, and can then draw higher current from the batteries which runs them down faster. My only suggestion re your instructions would be to tell the erstwhile repairer not to worry about the plastic lugs at the end of the wires from the coil nothing needs doing re these! We had one snag, the two copper wires on the side broke but I think they were long enough to solder back on. If too much pressure is applied, the oscillating movement of the brush head will continue but the pulsation will stop. Hi Dave, I think the first thing to do would be to run through our trouble-shooting tips, particularly the ones about the soldering and coil wires. Hi. If it isnt turning on i would be inclined to say the two battery soldering areas are not solid. We also have a wide range of dental supplies such as irrigators and brushes, home ECG devices and equipment to help diabetics monitor their condition. Also check for surface-mount components near to your soldering work that might have moved off their pads. Do you notice how the metal tag on the positive terminal extends horizontally away from the battery? this time absolutely remembering the correct battery polarity! The current is likely to be over 1 amp with the head attached. :-). Brilliant, thanks for this tutorial. Ive changed the battery charged it up motor works but the head doesnt vibrate/rotate. No mechanical function I can see so maybe used as an antenna to help with the induction charging? Diagnosed easily by Rob and the brush now works a treat. I hope it would work. Hi David, great to hear you got the toothbrush up and running and have given it a new lease of life! Thanks for the guide! . 3756/54. They dont like being recharged in this configuration. I would have thought that it is waiting for a charge since the red light is flashing. I have also seen that the charging coil wire is melted in the plastic on one side, could this be the problem? and that tiny round molding low down on the bottom cap rear, dont poke that in. So, I checked the troubleshooting guide (this helped too) and reopened to check the soldering points. Just succeeded replacing my battery! Is the pressure sensor LED blinking in sync with the green charging LED? Kim. Great stuff. I purchased a battery from you for my 3756. 2100mAh are 2100mAh, it is possible that it only lasts one cycle? The only fiddly part of the guide was avoiding melting the plastic posts on the pressure warning light cradle. It was quite easy. I have followed the directions to the letter, and everything appears fine. Using the screwdriver carefully press in on the white clips on both sides (one arrowed below) which hold the black coil support in place and unclip the coil, putting it to one side.
Looks tricky Not sure if its spot-brazed to the motor case.) Another brush saved ! When soldering make sure you burn the clear insulation coating off the wire to get a good connection. Most interesting Guides & Blog, will come in very handy soon. Seems the toothbrush and dead battery mayve simply sat around too long before the battery was replaced the linkage was stiff or tired who knows? But the metal from the pressure warning switch is getting very hot after re-soldering it and thats very strange. Expected a week out of it. Replaced the batteries on my wifes and my toothbrushes and they work! Just wanted to say thanks for the clear guide, and all went very smoothly, including the upgrade to a higher capacity battery. However, after reassembling and re soldering with the new (upgraded) battery and putting the toothbrush onto charge, I appear to be getting error codes through the green charging LED. Only when pausing longer than 30 seconds the timer resets to the initial starting point. Replaced the battery with long life version. What can I have done wrong? So Im very happy with my first attempt. I think if you were careful, the board and coil could come out together? Hi.
(Support us by buying from. Hi. I have rechecked soldering. For other toothbrush models and type numbers the battery replacement procedure is slightly different so please see our other guides to toothbrush battery replacement instead. I followed the instructions and cut across first, this required enough scissor pressure to start the cut which then cut right across. Thanks for the interesting measurements Robert! Sorry for late reply. 3. Now the pressure warning light flashes during charging as the charging light also do. Hi Kim, great to hear about your successful repair! Great instructions and spare battery thank you for allowing me NOT to throw away the toothbrush just because the battery had gone. Does this on and off charging and if left on the charger over night. When the brush is switched off the pressure sensor warning light flashes every 3seconds for about half a second.
Before it showed 1.3V after it shows 1,45V. Bravo! Its not the charger as another brush will charge on it. Bonjour Tristan, Great to hear about your successful repair! If only we could save the millions of toothbrushes that others needlessly bury each year! It needed heating up and rubbing with cloth to clean. Is there a way to disable it as I dont need it anymore and thatll stop it draining the battery. I did replace the battery as per instruction which are great However, I noticed that red light was blinking when I pressed the button on the PCB (before re-assembling) but I do not see it when I pressed the button after I re-assembled. Thanks for the feedback. Thanks again! So a new battery will rejuvenate your toothbrush. I have never come across a tutorial that has been so considered & precise. All Rights Reserved. The melted plastic near the charging coil is not a problem, but both coil wires must be soldered to the PCB and there cannot be any breaks between the solder points and the coil itself. I have only charged this toothbrush when it was dead. Best Regards, It seems to charge normally, with the light turning off upon charge completion. Any damage to yourself, your toothbrush or anything else is entirely your responsibility. Thanks very much guys and girls. Bought your 2.2AHr NiMH AA and followed the instructions above, didnt need the solder sucker or wire braid Id got to help with the job, but did use copper-pipe plumbing flux to very successfully rejoin the existing soldered parts. I can trigger the motor if I hold the battery so that one pin touches the motor outing and one pin touches one of the motor pins So I guess I either I heated something up or there is an excess of lead/tin somewhere. Thanks Maximilian.
More businesses should be aiming for reuse/repair like this, rather than throw away and buy new. If it is damp inside let the insides dry out for 24 hours then reassemble and test. it worked. I have tried fullyj charging and then letting it run to a stop (about 30 minutes) this short life is repeatable. Charges correctly via the coil and I can trigger a reset/lights test via a press & hold but the motor wont run. Plug the charging unit into an electrical outlet and place the toothbrush handle on the charging unit. Therefore, when the initial replacement battery stared to show signs of ageing a month ago, I didnt delay in ordering a new replacement; knowing that it would be an easy task to return the toothbrush to full working order. Sorry for spaming. Glad to hear you got your toothbrush up and running again Trevor! I was having to cycle 2 old toothbrushes that both only gave a couple of days use. Molto bello, spiegato bene, complimenti. Now, if only you did a battery replacement for the Philips Sonicare flosserits already taken apart, just need a battery. Eg. Let us know if you get less than an hour and we can send a replacement. So, I will watch out for it after a complete discharge. about 0.5seconds on, then 1 second off. No matter. My Account, Ionic Industries My remarks for bigger battery: Works a treat now, thanks!!! It seemed a daunting task to replace the battery. The hot water tip was good and saved my base clip. Thanks for the guide, i purchased the longer battery with more mAh from your ebay store. The instructions are very clear, precise and accurate; well done and thanks for the information. I see a strange phenomenon with my 3756 toothbrush: Thx for ANY helpful ideas (i also checked all internal components) Somehow the charging mechanism doesnt work after reassembly. I get 5 short flashes when I put the toothbrush initially onto charge, then as the toothbrush is charging, rather than getting the normal 1 longish flash on the green LED every 1 second or so, I get 2 short flashes every second. I was able to resurrect 2 3756 brushes that were all but dead. Everything went according to plan and I am now getting the full use of the higher capacity battery. I have tried disconnecting the new battery and wiring in the old battery, but no joy. I agree with the other comments a solder pump was much easier to use than desolder wick. (Only thing Ill watch out for when buying batteries next time is the orientation of the soldering lugs. Thanks! It involves small amounts of heat and is commonly taught at school for jewellery-making and electronics. I have good soldering kit, so didnt have problems with melting plastic or de-soldering fine wires. I have now repaired my toothbrush (since my wife got a new one!) This way seemed to save melted plastic, however Im probably nitpicking. It means we dont need to take the charger in the camper van anymore. This is clipped in on both sides at the top of the brush, see the arrows below. Also with good results you feel some accomplishment, some satisfaction On a slightly more serious note, I de-soldered from the PCB in the order of, charge coil, neg battery terminal, pressure sensor LED, motor terminals, pressure sensor, pos battery terminal. Thanks again. I replaced the battery a few years ago with the larger type and it worked well. I desolderd the pressure sensor, but it kept blinking (when brush was off). Thanks for the feedback Keith and for the tip about using desolder braid. How can I check if the battery is being charged? The brush should now run as normal. Dismiss. I successfully rebatteried my wifes fancier Braun last year, so this is beginning to become a habit for me, thanks to Ionic. Take a look at the picture below to see how the positive tag extends through some empty space inside the handle. The original blink was a slow on and off. I had to modify the battery holder as I bought a longer battery and it worked like a charm. A stray blob of solder can cause a short circuit. Hi, what an awesome guide! I have kept your very good instructions in my web Favourites since I last used them to replace the battery in my Braun Oral B 3000 toothbrush two and a half years ago. Hi Asle, there might be a short-circuit caused by a stray blob of solder. Initially, I did everything per the steps (except de-soldering the pressure warning light connections, also followed a video).
See the picture below for (left to right) replacement 42mm battery, original 42mm battery and replacement 49mm battery. Great work repairing your toothbrushes James! Thank you for this excellent tutorial. Do you know what causes this? However, I have just de soldered everything and re soldered all the connections and put it on charge again to reset it on its now operating ok. Just take your time and go carefully. When the battery is temporarily replaced with a spare or even just turned around and inserted back to front you can see how the battery comes up against plastic spacing stoppers (arrowed below) which prevent it from sliding up any closer to the motor. 
Great instructions. Unfortunately i`m stuck (probably messed up something on PCB. You might need to reset the battery meter as shown on our troubleshooting page, or there might be a stray blob or whisker of solder on the PCB causing a short circuit somewhere. Having put it back together I have no parts left over and the charging light is flashing. An excellent repair guide. Thats how its designed to come apart! The battery itself seems to be charged up properly. One minor word of warning If modifying the battery carrier to take a larger (49mm) battery be very careful not to break the clip mounted on the end of the carrier that holds the circuit board onto the carrier when fitted. For the best experience on our site, be sure to turn on Javascript in your browser.
There could be some debris rubbing inside the gearbox, or the frame might be twisted slightly. I modified the battery carrier following your instructions to take the longer battery and reassembled with no problems and no glue required. You can try leaving it running continuously with no head attached after oiling both ends of the motor shaft, to see if that helps. It the pcb version with sop-20 housing chip so it differs from yoursmaybe older but its an 3756 model. However, its more likely with yours that one of the charging coil wires has come off. Then its on to the copper wire solder points for the charging coil (arrowed below, right) and the pressure warning light (arrowed below, left). Any suggestion? No need to go glueing around the seal. Nestor. Anyway. Almost as though it does not turn off when switched off. Hi there! (If this is added, silicone sealant needs to be added to the Tools/Parts/Equipment list). Its so important to make this straightforward for end-users! and was very careful when disconnecting the battery. I like to keep things simple as I am not very experienced in soldering. By the way after 6 years using it 4 times a day it did not last more than 3 days without charge. I checked the replacement battery was between these limits (it was 1.271V) before fitting. I charged the accu before inserting it, it had 1.35vbut never charged in the brush, only red blinking. I was quite careful, did not do too much desoldering, dont have the pressure sensor in my model 3754. The only issue I had was when de-soldering the de-solder pump plunger cap flew off and it took me 25 mins to find where it actually gone, found behind a picture frame on the wall on the other side of the room! One thing: if desoldering the wires for the pressure warning light, the wire is melting the plastic where it is winded up. Be very wary of connecting Ni-Cad and Ni-MH cells in parallel. It then charged for about 36 hours (flashing green) being tried for a while. I lost one but the other was fine.
The Professional Care 3000 rechargeable toothbrush has a waterproof handle, is electrically safe and is designed for use in the bathroom I also used the scissors on the knife to trim the battery tabs. At this point you might realise that you have fallen victim to Brauns designed-in obsolescence and non-repairability if the plastic tab at the front of the base breaks off. The charging indicator would keep flashing as normal, so it appears as if its charging normally. Many thanks for the instructions, this has saved yet another one from landfill! The new battery had enough power to run the motor so I know the batter was soldered on properly. The red charge indicator light starts blinking when the rechargeable battery is low.Pressure SensorFor optimal brushing results, Oral-B Professional Care has a pressure control feature to help you brush gently. Everything back in working order, great and thanks for the suggestion to replace with a bigger battery, much better than the original. Something could have moved or got damaged when soldering in the new battery. An illuminated magnifying glass helped a lot.
No, lithium batteries cannot be used to replace Ni-MH batteries. Another toothbrush saved from an unnecessary demise, thank you Ionic. I looked at the online copy of the instructions, but there is no info on a faster blinking. I recently replaced a battery due to the pressure sensing light of the oral-b pro 1000 kept flashing (and the toothbrush would lose power after a short time after attempted recharging prior to battery replacement).
Higher capacity means your toothbrush will run for longer before it needs recharging.
If I then leave the toothbrush on the charger under this condition, then the pressure sensor light wont flash during the charging process, and the battery is also (interestingly) able to reach fully charge. Hi, thanks very much for your great instructions. Great to hear about your successful repairs Glenn, and thank you for the tip regarding desoldering order. I replaced this battery about 3 years ago and has worked well up until lately.
I did change the battery to a 3756 and it lasted one cycle for 10 days. So thats a big improvement. The pressure sensor LED will only illuminate if the wires are connected with the right polarity. I am not an electronics geek, but was able to follow the guide without too much trouble.
It sounds like a bad connection to the battery. After few hours on the charger without any sign of life it started blinking! Soldered it back on and good as new. Im happy to say my toothbrush is now back to full function. I just reassembled my toothbrush after following your instructions. Thanks for the tip Barry! In addition to feeling it, you hear a different sound and a red light glows on the back of the handle.Professional TimerA short stuttering sound at 30-second intervals, which you can hear and feel, reminds you to brush the four quadrants of your mouth equally for a thorough consistent clean. And,, as somebody already said it is a step against this throw away world to save the planet. Not the slightest motor sound. Thank you! Hi! The green charge indicator light flashes while the handle is being charged, and when the handle is fully charged the green charge indicator light shines continuously. It helped me change the battery to bigger one after 6 years of using my toothbrush. Id suggest re-fitting the old battery and checking for shorts on the PCB a common one is the pressure sensor switch (if fitted) connection touching the positive battery connection. In the end it got a little messy since I had repaired the solder joints twice and added extra battery solder, but the toothbrush works as good as new! Speed seems fine on first use after full charge. Could you please help. Also useful, a big blob of blu-tak to bed the chassis when soldering. Does a faster blink pattern mean something? My 1st time trying to fix a gadget, helped by a friend with a solder iron. Im looking forward to upgrading my wifes brush when the time comes! The problem is that after charging for +8 hours the brush does spin for a couple of seconds and then red light shows up indicating that the battery is flat and it dies.
It should be above 1.0V to run. After an hour it can be used. Maybe during disassembly I could have shorted something on the PCB although Im not aware of doing so. This is almost exactly the same as the old battery was doing. Good morning. So what is the problem? Thank you for your advice! The + end of the battery is closest to the motor. I would note the, err, current best practise for charging Lithium-Ion & NiMH batteries is *not* to run them flat, nor charge to 100%. So important to keep it watertight. Thanks again for the wonderful site! Use the screwdriver to pry off the plastic ring from around the shaft. For professional use only. To the EU users, bear in mind some countries now you need to pay taxes upon package arrival. Thank you. Oh . And yes, the 2.2Ah batter did arrive charged to 1.3V so was able to run the motor without initial charging- which I checked to ensure I hadnt wrecked it during disassembly. It works without it as well.
I took the plunge and decided to go for the larger battery but had no difficulties at all. When replacing the battery with the longer one, why do you have to bend the tags in that in and back out again then up pattern with a flat screwdriver tip? So satisfying to renew this battery. Cant figure out how to get it apart to see what the problem is. Hi David, good work with the install and checks strange that its not working Have you tried leaving the brush on the charger for an hour? Its stopped after a few minutes. The new battery however will not charge, no green charging light. We have a new guide to opening and repairing the Type 3766 and 3767 brushes in our list of battery replacement guides.
Im thinking that in this case, my original battery was probably ok, and the circuitboard isnt 100% well. 
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