A fairly simple question with a not so simple answer.  Ultimately digital camera power comes from the sun, but you probably want a more specific answer like your lithium battery.  Digital camera power is taken from a tiny rechargeable battery inside the camera.  This digital camera power can be recharged in a number of ways, [...]

If you have a digital camera you more than likely have a digital camera lithium ion battery installed.  These are now the de facto for digital camera power.  In addition they are used in almost all of the small portable electronics available today.  The reasons for this are obvious if you look at what makes [...]