C.K.
My daughter did that 14 years ago. At that time I was told that they rarely leak, BUT, I had to send the batteries to poison control to be examined and be sure that they did not leak. One of the 2 that she ate took almost a week to come out. They had exrayed her and both showed up on the x-ray. She is a little nutty to this day, but very bright, happy, and tallented. Hope this helps
C.