How to remove and re-install the battery of a Sony Vaio VGN-S260
Flip the laptop over so the Vaio logo is facing down
Locate the battery at the top and Find the release and unlock slides on the battery
Slide the unlock tab to the unlock position
Slide the release tab in the direction of the arrow, i.e. towards the unlock tab
With the tabs still in the unlock position, slide the battery away from the main case.