Charge the batteries at the charging station inside the Steamfont Windmill ( -1021, 143, 1110 ) Copy/waypoint -1021, 143, 1110
Install the charged batteries in the clockwork gnome observatrons (see the picture) in the building east of the Steamfont Windmill at ( -1093, 144, 1102 ) Copy/waypoint -1093, 144, 1102. To do this, simply right-click on them. It will install the battery and add the Gnome Observatron to your inventory.