The battery in your Mini Cooper is what gets it started when you first jump in and turn the key or press the button. There are some distinctive signs that let you know when it is time to replace the battery.
If the battery goes flat several times within a short time for no reason, then replace the battery as it is not holding its charge.
Slow to Crank
Cranking is when your car turns over when you first start it. If you find that the car is slow to crank, particularly in cold weather, then it is time to replace the battery.
If your battery has trouble running all items on your car at once, then it can be a sign something is going wrong. For example, if the headlights dim when you roll the windows up, or if the widows move slower when you turn the radio on, then you should start budgeting for a new battery.
Broken or Cracked Case
If you have a broken or cracked case and you can see fluid coming from the battery, then you should replace it as soon as possible. It can be cracked by an accident or by sliding around during hard cornering.