Extended batteries: size of 2100/3600 mAh?
 

I am looking at getting either a 2100 or 3600 mAh extended batter. The 3600 mAh will add 1/4" to the thickness of the 6800. Does anyone know how much thicker the 2100 mAh battery will make the 6800? If they are the same thickness, I will likely go with the 3600 mAh. Thx.