Battery dying? 2018 Silverado LT

I’m sitting at work thinking about an issue I’m having.

About five days ago, my 2018 Silverado started occasionally hesitating when I start it. When I turn the key, it doesn’t immediately start. It’s like the battery is totally dead. Then it will start up after a second or two.

I’ve never had a vehicle act like this, but I’m assuming my battery is just getting weaker, and I need to replace it.

Thoughts?

EDIT: Changed the battery last night. All seems good. Thanks.