I would suggest contacting Capcom. Even if their USA division doesn't handle the japanese versions, they may know someone who may be able to replace the battery, and refresh the decryption key, or send you a new dongle.
> My WarZard pcbs worked fine until two day ago;I don't make any swich rom because
> i have 2 Warzard complete kit: 2 motherboard, 2 cartriges, 2 cd rom drive with
> Now when i test these pcbs (all two setup) i can see truly a strange screen
> green with no understandable pattern i think there was a batteries suicyde and
> i'm so warried for this wonder game wich most people unfortunately never see :(