Sonicare Toothbrush and Inductive Charging

I recently started using a Philips Sonicare Toothbrush.  The first time I went to charge it I noticed that there was no metal contacts between the charger and the toothbrush.  This toothbrush is charged through inductive charging.  Basically the charger base and the toothbrush form a transformer when they are brought close together (when the toothbrush is in the base).  Energy is inductively coupled through the transformer from the charger base to the toothbrush, and then used with some electronics inside the toothbrush to charge the battery.  I guess this is a fairly common means of charging batteries in applications such as medical implants and electric vehicles.  One major advantage is safety because there is much less risk of shock with no exposed metal connection points.  In my investigation I stumbled upon a great resource for information about batteries and chargers at MPower Solutions.