How do I properly maintain my Vauxhall Grandland's battery?

I have noticed that my Vauxhall Grandland's battery is not holding charge like it used to. What are the steps I can take to properly maintain my battery and improve its lifespan?

Regularly check and clean your battery's terminals with a mixture of baking soda and water to remove any corrosion. This can help improve the battery's connection and overall performance.

Invest in a battery charger and keep your battery charged at all times, especially during long periods of inactivity. This can help prevent the battery from draining.

Ensure that all electrical devices and lights are turned off before turning off your car's engine. This will prevent unnecessary strain on the battery.