When do i change the battery to my sony camera?

i notice it runs out of battery fast maybe i dont charge it long enough. how long should i charge it before i use it.When do i change the battery to my sony camera?
You should charge it fully the night before you intend to use it. The chargers that come with the camera, automatically shut off once the batteries have fully charged.When do i change the battery to my sony camera?
It depends on the battery, but usually each charger will have a color or pattern of lights that indicates fully charged.