Most laptop batteries are rechargeable. However, a battery is only rechargeable to a certain point and then it will fail to hold a charge, rendering your laptop non-functional. You must then remove the dead battery and replace it with a new one. Fortunately, Sony sells replacement batteries for the Sony VAIO that you can connect to your laptop in order to restore its functionality.
Place the laptop upside-down on a flat surface.
Hold the switch near the battery in the "open" or "unlock" position, then slide and hold the "Release" switch on the battery. Lift the battery using the depressed tab on the pack.
Remove the battery by pulling it up from the laptop, then lifting up diagonally from it.
Insert the new battery inside the laptop, sliding it diagonally and aligning it with the projections at the edge of the battery compartment. Lower the battery until you hear the switch click, then slide the battery switch back to the "Lock" or "Close" position.
Plug the laptop into a power outlet with the AC adaptor to allow the battery to fully charge.
Allow up to 12 hours for the new battery to fully charge.