How do electric toothbrushes recharge their batteries? There are no electrical contacts, just a little plastic sticky upy thing on the charger that goes into the bottom of the brush?? So how does that work?

Must be some sort of trickery.

Read somewhere before about a pad for mobile phones. You lay the phone on it when you come in and hey presto it charges.
I'm sure it's like an induction motor where there are no brushes as such or similar sort of technology.

Induction. Next

Wikipedia is your friend

Quit being a sissy and using the stock battery . If it has a motor, it needs to be hot-rodded
http://www.youtube.com/watch?v=RNv5TMwAZlc