Yesterday my car wouldn't start up. But today it did start. I let it run for a couple of minutes, turned it off, and then turned it back on. I believe that I need a new battery but I just wanted to make sure before I spend $100.

 

Got to any auto parts store or Sears and they will test your battery and charging system for free.

 

Do you have any type of key bob or "fob" on your keychain that possibly emits a radio signal? I have one on my keychain that I use to get into my office. I have to scan it at the door to unlock themagnetic lock.Sometimes it causes my car to not crank. If you still suspect the battery, go to an auto parts store and have it checked for free as falkore said.