I saw an old post somewhere that said to buy the battery, a CR 2032 (3 volts), from an electronics store. It then gave instructions on how to install it -- too long to type here. But the address is http://nextdch.mty.itesm.mw/-rlopez/M1battry.txt. If that doesn't work, search "Korg M1" on Hotbot and the item should show up. It's from 9/5/95. Good luck. I'll probably be doing it myself soon.