However, I see another problem. As I said, the batteries being tested are 1.2v NiMH/NiCD or 3.7v LiPo batteries. If testing a 1.2v battery, I'm sure the voltage will drop quite a bit at 100A. Assuming a worst case transistor scenario; if the shunt is dropping .1v, that means the tranistors will have to have a C-E saturation voltage of .7v or less (I figure I can stop the current test if the battery voltage drops below .8v since anything below that is unusable anyway). I can't seem to find a commonly available transistor that has a low sat voltage when passing any appreciable current - and the more collector current, the more the saturation voltage. So, I guess I'll have to use MOSFETs?