Braun Oral B Sonic Complete 4729 Battery Replacement Repair Guide

Difficulty

Very easy

Steps

3

Time Required

                          5 - 10 minutes            

Sections

1

• Battery
• 3 steps

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Introduction

The battery of my toothbrush died and i have to replace it cause its a shame to throw away a electronic device just because the battery is death. I already opened it to see what kind of battery sits in there.

Now i ordered some replacement NiCd batteries and have to wait until they arrive. Probably NiMH batteries could be used too, at least they have same voltage but there might be some problems with the charger cause NiMH batteries can explode if overcharged.

NOTE: There are some very thin wires inside the toothbrush and you may destroy your device while “Repairing” it. But who cares if the manufacturer says your only option with a death battery is to bring the device to a recycling facility.

NOTE: Check your local regulations for recycling toxic waste (NiCd-Batterys)

What you need

Step 1

              Battery               

• Push the bottom of the toothbrush against the knob on the back of the charger. Turn counter clock wise and the bottom should pop off. Put the toothbrush top down on a hard surface and push the inner part out.
• Be careful with the thin wires connecting the bottom cover to the circuit board.

Push the bottom of the toothbrush against the knob on the back of the charger. Turn counter clock wise and the bottom should pop off. Put the toothbrush top down on a hard surface and push the inner part out.

Be careful with the thin wires connecting the bottom cover to the circuit board.

1024

Step 2

• Remove the old battery pack.
• The Batteries are soldered to the circuit Board. You can use your soldering iron here if you like but i think its not really needed. And probably the minus is quite hard to work on because it lays under some other stuff (fig. 3; The circle marks the minus and the square the plus connection).
• If you’re not using a soldering iron you have to peel off the wire guard from the old batteries to remove them cause they are your connectors for the new batteries. The spring in the bottom cover provides enough tension to keep the battery in place and connected without soldering.

Remove the old battery pack.

The Batteries are soldered to the circuit Board. You can use your soldering iron here if you like but i think its not really needed. And probably the minus is quite hard to work on because it lays under some other stuff (fig. 3; The circle marks the minus and the square the plus connection).

If you’re not using a soldering iron you have to peel off the wire guard from the old batteries to remove them cause they are your connectors for the new batteries. The spring in the bottom cover provides enough tension to keep the battery in place and connected without soldering.

Step 3

• Insert new battery pack.
• If you unsoldered the old battery from the circuit board you have to solder the wire guards from the new Battery pack to the circuit board.
• Otherwise just insert the new battery pack and reassemble the toothbrush. I used a pice of cardboard to make sure the plus gets proper connection (fig. 1).

Insert new battery pack.

If you unsoldered the old battery from the circuit board you have to solder the wire guards from the new Battery pack to the circuit board.

Otherwise just insert the new battery pack and reassemble the toothbrush. I used a pice of cardboard to make sure the plus gets proper connection (fig. 1).

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                                                                                      5 other people completed this guide.                                             

Author

                                      with 2 other contributors 

                    ndjenny                     

Member since: 03/20/2013

1,719 Reputation

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Ron - Sep 17, 2013

Reply

what is the replacement battery and where can

I get it?

ndjenny - Sep 19, 2013

Hello Ron,

if you put: " Sanyo 2/KR-600AE 2/3 A Cadnica NiCd Battery Pack 2,4 V " into a search machine you should be able to find a replacement battery for this type.

At least thets how i got mine…

Kind regards Andy

Rob - Feb 20, 2014

Reply

Do you need to buy 2 of these batteries? It looks like two separate batteries end to end.

ndjenny - May 29, 2014

sorry for the late reply. No you don’t need two batteries. Actually its a 2/3 A battery that means its 2/3 as long as a full A-size battery. in my case they delivered two 1/3 A batteries in one shrinking wrap but there are also 2/3 A batteries in one piece.

Chris Murphy - May 20, 2014

Reply

I /think/ any “2/3 A” size battery should work - I’ve ordered some NiMH ones with nearly double capacity - I anticipate that these will hold more, but take longer to charge up.