Has anyone ever made a 7.5 volt battery for one of these mic's by stacking the 1.5 volt watch batteries in shrink tubing ? It looks like it could be done an I figure if it's been done someone has tried it here !I ordered some from Ebay because I can't find them here an it's been a week an they still have not been shipped an I want to get this mic working . I am pretty sure I can find the watch batteries locally . Thanks !