The engine won't crank (and the accessories and lights are off) ...
You've had to jump start your car a lot. ...
Car batteries have a finite lifespan
Batteries gradually deteriorate until they can no longer provide enough power to start an engine. This wear time could take two to three years and a vehicle's usage pattern is one factor contributing to the rate at which a battery will age.
What can drain a car battery when the car is off?
What may drain a car battery when it's off are things such as interior lights, door lights, or even bad relays. While your engine runs, the alternator recharges the battery — which is why you typically don't have to worry about the battery dying while you're blasting the radio on your drive to work!