Perhaps someone can help me figure this one out. I've got EMG pups and electronics which use a 9 volt battery. For some reason, in the last year the battery has been losing its charge even if the cord isn't plugged into the jack. The last battery only lasted 2 months!! I've been using Duracell and Panasonic with good results. I looked at all the wiring and the jack and can't find anything obvious which may be causing the problem. Also, everything sounds find when I install a new battery, so I think the electronics are good. Any suggestions would be helpful - short of unplugging the battery once I'm done playing.