- 1). Deplete the rechargeable battery of any charge. Take the brush from its recharging base and turn it on and let it run until it stops. Repeat this step until the brush no longer turns on and off.
- 2). Remove the small trapezoidal rubber bumper at the back of the Sonicare. It can be found at the top, toward where the brush connects to the body of the toothbrush. To remove it, it may be necessary to use the flat-head screwdriver to pop it out of its housing. Make sure not to lose it.
- 3). Separate the cuff from the brush head, removing the rubber bumper allows you to do this. Once the brush head has been removed, place the cuff back onto the handle. Tighten the cuff onto the Sonicare handle and twist to the right until you feel the housing begin to loosen. Once it's loosened, pull the housing out and you should see the inside of the brush.
- 4). Locate the two solder points on the PC board inside. These will be the metallic points that hold both the board in place, as well as allow for a circuit connection to the battery. They are located in the center of the board about 3 inches from one another. Use a soldering braid and a soldering iron to free the legs from the board and the battery from the back of PC board. Turn the brush over and pull the battery out, you may need to use the screwdriver to dislodge it, but with the un-soldering you just did, that shouldn't be difficult.
- 5). Turn the brush back over and solder a wire to each of the solder points on the top of the PC board. The wires should be about 2 inches long and stripped on both ends (enough so that you can easily solder them to the board). Make sure they are secure. Once soldered to the top of the board, tuck them through the side of the board and have them stick out from the bottom-side of the brush, where the battery once rested.
- 6). Get your 4/5A battery cell and scratch up the positive and negative terminals with a hobby-knife or your screwdriver. You just want to make sure to create enough of a surface so that the solder sticks to it as opposed to rolling right off it. Don't destroy the battery.
- 7). Use the soldering iron on a lower wattage (if that's not an option, use a lower watt soldering iron, as you don't want to apply too much heat to the battery) to attach the proper wires you assembled in Step 5 to the proper terminals of the new battery. Connect the positive wire to the positive wire, and the negative to the negative. Shove the battery and the wires into their proper compartment once the soldering has dried and is secure. Make sure they are tight and compact in the housing.
- 8). Slide the reworked internal mechanics back into the outer-brush housing. You may need to apply a little force to get it to click back into place (as the wires may take up more space than it used to), but you will get it to click.
- 9). Reattach the small trapezoidal piece to the back of the brush to lock everything in place. Reassemble the brush and test it out. You should now have a replaced battery in your Sonicare Toothbrush.
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