How-To: Replace your electric toothbrush battery

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By Becky Stern
Posted 2010/09/10 @ 7:33 am
Category General

Instructables user AaronX621 writes:

This will show you how to replace the internal battery on your Sonicare Elite 7300. After having my 2nd one die on me within 3 yrs I figured out how to rip it apart and fix it.

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3 Responses to How-To: Replace your electric toothbrush battery

Chris W on September 10th, 2010 at 9:17 am said:

It is a great idea to replace a bad rechargeable battery when possible. My cordless soldering iron is on its third set of batteries. My Braun toothbrush had a special key molded into the charging base for removing the battery. I was curious so I placed the toothbrush into the key and gave it a twist. There was a strong spring inside which forced the toothbrush apart, breaking the thin wires to the charging coil. D’oh! It was only meant to be used to recycle the battery at its end-of-life.

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- Silverman on September 10th, 2010 at 9:35 am said:
  
  Aha! The recycling symbol made me delay opening my Braun until it has to be opened. Thanks for the warning. Do you think it would have been possible to replace the battery if you had known about the spring? Did you end up being able to repair your toothbrush?
  
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  Chris W on September 15th, 2010 at 3:36 am said:
  
  I think I could have fixed it. One of the coil wires broke where it entered the coil. I unwound the entire coil of very thin enameled magnet wire, and then rewound it with a short piece hanging out. I had it ready to reassemble, but left it out for a few too many days and my wife threw it away! To be fair, it may have been a few too many weeks or months. Definitely less than a year. The expensive rechargeable brush came with a free second one which used disposable AA cells. I used it until the bristles wore out and then I wore out the brush head from the expensive one. Other than the built-in charging and a silly timer, I think the cheap one was as good as the expensive one. Ever since, I only buy the cheap units because they cost about the same as a replacement brush head. I put my own rechargeable AA cells into them.
  
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