The battery in a 2006 Buick Lucerne is located underneath the rear seat. To access it, you’ll need to move the back seat away from the floorboard and it should reveal the battery.
If you’re having issues with your battery, the first thing you should check is how old the battery is. Vehicle batteries typically need to be replaced every three to five years, but they can wear out faster due to some driving habits or exposure to extreme temperatures.
If your battery is due to be replaced, you can take your vehicle to a mechanic – they can properly assess the battery, diagnose any issues, and replace the battery if you need a new one.