A. Some people measured the battery consumption rate and found that using the CHDK does not affect battery consumption (either not at all, or just minimally). It makes no difference whether the live histogram etc. is activated or not, because the CPU of the camera always works (looking for keyboard presses in the loop). Btw, histogram is calculated even it is not displayed. But, with CHDK the user usually increases the time when shoot button is half-pressed. Because he is looking at the histogram, zebra, etc. Not just at the green/yellow rectangle. Boot: 200 mA Play mode : 170 mA Zooming: 600 mA