The Canon PowerShot SD200 has a 3.7V Lithium-ion battery that requires it to be removed from the camera in order for it to be charged. This guide will show you how to remove the battery from the camera assembly.
Use your fingernail to slide the dark gray tab located on the bottom of the device towards the edge of camera.
Slide the light gray door away from the LCD screen and pull up to open the door.
Rotate the small brown tab towards the edge of the camera.
The battery should pop up.
Pull the battery straight out of the battery holder.