Finally was handed down my bro's xg-7. Had to clean the batt terminals to get it to power up.It still acts as if it has weak battery. (shutter in lower half of light meter scale goes halfway and waits about a minute before it completes cycle.)Could be my unfamiliarity with an old man., or cams in general. Wal-mart handed me 2 Energizer 303's. Or do I need to go with old mercury? Or, are the 303's adequate?