I noticed on the Book Courier web pages that a recent update was to include a setting for whether the user was using rechargeable or non-rechargeable batteries so that the user could more accurately determine how much battery life was left in the unit. I think this would be a good addition for a future Bookport upgrade (since the Book Courier and Bookport are basically the same hardware). I would guess many users (like myself) use rechargeable batteries in their Bookports. This is not only less expensive, but more environmentally friendly. -- Pete