I can go a majority of the day without using the SB in tablet mode, but my clipboard portion battery still drains substantially. I used the clipboard only for about 5 minutes today and both batteries are showing in the 30-40% range. I thought the keyboard battery was supposed to be primarily used when connected so the clipboard maintained battery for when it would be disconnected. Not sure if this is normal or not. If anyone has any comments, please let me know. Thanks.