What tool to widen the opening of a battery clamp to attaching them to a battery?

To widen the opening of a battery clamp for better attachment to a battery, you can use a pair of pliers or a screwdriver. Gently prying the clamp's jaws apart with pliers is effective, while a flathead screwdriver can be inserted carefully to help widen the gap. Be cautious not to apply excessive force, as this could damage the clamp. Always ensure a secure fit for optimal electrical connection.