Quote Originally Posted by gchpaco
I've flatlined the batteries on an FM3a before because the MD-12 will always insist that the body power the meter if it's on.
Me thinks your MD-12 is more of an MD-11 or not working properly. An MD-12 will automatically shut off even an FE's battery consumption after about 30s, something the camera can't do on its own. An external 2-pin release cord will drain the batteries of any camera used as long as the MD is switched on, though.