erm, this happened to me when i got my ibanez EDA, i think its one of 2 things, i always left the cable plugged in when it was just sitting in its stand, and that drains the battery, plus i recon they put the cheapest of the cheap batterys in as stock, i replaced it with a duracel procell or something, and its been fine, i recently replaced it with another one, but after a year and a half, i think i was pushing my luck with keeping it in
