Left-click on the green battery icon and choose to View Scheme Settings. When the box opens up it will show you the battery settings for the Scheme you are currently using. Click on the little AC Plug icon on the lower right, then you will see the current settings for AC power.
On that dialog box, there are 2 small icons, side by side on the bottom right - these icons are battery on the left and AC plug on the right. The left icon is for the battery settings and that is what is what is displayed when you first open "View Scheme Settings". Click on the small AC plug icon on the right to see the AC settings. Click on the small battery icon on the left to see the battery settings again. When you create a Scheme in Battery MaxiMiser, you can adjust all the settings for when on AC power as well as when on battery power.