I have changed the battery several times, but I keep getting a low battery. The Key fob also does not perform correctly. Does not lock the car with one press of the lock button! Sometimes it does not work at all. I am not sure why this is happening.

 

The terminals inside of the key fob have probably gotten dirty or the springs have lost there spring tension. Open the key fob, grab a qtip and alcohol clean the copper terminals and all contact points. Then with a small screw driver bend the springs slightly so they give better clamping force on the battery. Make sure you are using top quality batteries, and not no cheap aftermarket.

 

you can still turn the car on by putting it on the start button