The lithium-ion battery in your hybrid vehicle is meant to last for the lifetime of the car. Unless there is a defect, it is unlikely you will ever have to replace your hybrid’s battery. Most warranties cover the battery for 8-10 years, so if you are within that period, there’s no reason you need to replace the battery yourself. But if for some reason you do need to change your hybrid’s battery on your own, it can be done.
Buy a new lithium-ion battery that is compatible with your particular model of hybrid car.
Remove the housing bolt (if present) using a ratchet wrench. Pull the battery out and place it somewhere safe to await disposal.