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EEVblog #284 - Braun Toothbrush Teardown

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Marty1:
The information I'm looking for can't be found, so I devised the following experiment in order to gather new information.

The hypothesis, is that the toothbrush is being overcharged, which wears out the battery at en ever increasing rate.

I halved the charge time of the brush and measured how long it would run for.

Low and behold, the runtime was the same with half the charge time.

It charged for 9 hours ((instead of 18 hours) and pulled it off the base / charger while the green charging indicator was still blinking.

The run time that I got after that was identical to when it was charged until the automatic cut-off /  termination after 18 hours of charging (green blinking indicator light).

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