Sonicare

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Sonicare is an electric toothbrush manufactured by Philips.

It vibrates at hundreds of times per second, as the name implies, with the latest models at 40,000 strokes per minute. Rather than connecting to its charger with conductors, the charger includes the primary winding of the voltage-reducing transformer and the fat handle of the brush includes the secondary winding. The magnetic field is not shorted out by spilled liquids around the sink, as an electric field would be. The replaceable head also is driven magnetically. The first Sonicare toothbrush was available in 1983.

[edit] Battery life

Many users complain that the batteries on several models of Sonicare toothbrushes give out after only 1-2 years of use. The batteries are not "user replaceable", though with considerable effort, the consumer may replace the batteries with third-party parts.

Replacement batteries: