Vinnie and Ken, thanks for the replies. Battery power is the answer. No more gaso..., I mean AC mucking up the works. Ken, I left it on with no music playing, amp off, for 10 or 12 hours or so, maybe longer. I just have to get used to turning off two switches after years of leaving everything on...

Below I have pasted Ken's announcement of this product. I am using it with the Sony D25 and am just thrilled with the combination. The build quality on the battery pack is excellent. I am surprised to find that it ups the volume output of the player. Why, I have no idea, but it helps since I am...