• Several car problems can indicate it's time to replace your car battery.dead battery image by Katrina Miller from Fotolia.com
  
  The battery of the car provides it with the power needed to start the engine. Car batteries, on average, last about four or more years, according to automotive experts at Newschannel 9 WSYR in Syracuse, New York. When the battery begins to fail, a car may experience several symptoms.
  
  If battery failure is suspected, see an automotive specialist. Diagnosing the problem and replacing the battery should be done by a professional mechanic.
  
  

Engine Trouble

• A slowly cranking engine is often an indication of battery failure. Because the battery supplies the initial power to the engine, the biggest indicator of a dying battery is a slowing of this process. Listen for extended starts, and slow or interrupted engine turnover, according to GNB Systems.
  
  

Weather Sensitivity

• Loss of power in cold weather can also indicate trouble with the car battery. Any change in the start-up process associated with changes in weather should be checked by a professional to rule out battery trouble and diagnose the problem.
  
  

Discharge Light

• Many cars are equipped with a battery discharge light on the instrument panel. According to GNB Systems, when this light is lit, the car battery and electrical system should be checked by a mechanic.