Not neccessary! It could be the alternator. Get yourself a multimeter and google how to check alternator (or just go to the local part store and ask them to check the alternator/charging system.

By the way, i am strongly recommending that you find a new mechanic

 

Let us know how it goes.

Curious. Did the place that replaced your battery load test the one they just took out? Normally that's required for warranty replacement.

JR

 

I will let you know if I have any more trouble. No the dealer did not check the battery when he gave me a new one.