Dory: I suspect you will notice no difference in battery life, but theoretically the batteries could last longer. This is because the speakers are providing their own power, and thus don't present the load that a pair of headphones would. Rob Meredith >>> doryfish@xxxxxxxxxxx 08/12/05 11:18AM >>> If fairly good-sized powered speakers are used with the bp, should one anticipate a diminished battery life? Dory doryfish@xxxxxxxxxxx