Hi Sharon: You can expect to get anywhere from 60 hours of battery life with text and about 30 hours with audio, however, results will differ, depending on the type of battery, but that's just to give you an idea. Audio files do take more power to play than do files that use the builtin speech. Hope that helps! Pamela Rader, TECHNICAL SUPPORT American Printing House For The Blind 1839 Frankfort Ave. Louisville, KY 40206 PHONE: 1-800-223-1839, Ext. 307 >>> mt281820@xxxxxxxxxxx 11/18/07 06:14AM >>> I seem to experience a big difference in battery life with text vs. audio books on the bookport. Sharon