Changing the Battery in Your mazda new key 3 Key Fob It's frustrating to drive off at the end of a long day and discover that the key fob is dead. Fortunately, it is an easy fix with the simple replacement of a battery at the hardware store or big box retailer. A spare key fob for your mazda 3 lost key 3 is an inexpensive method to avoid having to be towed t...