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Take it to AutoZone they have a free tester which checks battery, alternator and starter all in one test machine. It's easy and free.
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It is also worthless. I am trying to get them to replace my battery from my Armada It goes from 12.7v to12.3 in 45 minutes - sitting in my living room so no chance of a draw from the car. They said it tested good (tested at 12.3 - had it fully charged when left house and arrived at store 45 minutes later). So I put the battery in the car and drove the car to AZ so it would be fully charged when they tested it. They came out and tested it and said it was good. Asked to be checked again and the battery voltage dropped from 12.7 to 12.5 (12.5 is only 75% charged - I lost 25% charge in less than 2 minutes) in the 2 minutes since the last test. The employee saw this and agreed the battery was bad but since the tester said it was good he could not replace it. Told me to go home and drain the battery down to nothing and bring it back. They do not bother tested completely dead batteries, they just replace them. NEVER trust the testers at these stores.
I had the same problem with the battery in the 944 3 months ago, but with Wallyworld. It took several times of bringing the battery in before it tested bad. It worked out though...I bought the battery in NJ and am now in AZ. After it tested bad the guy told me he would check to see if I owed them any money for a new one. I bit my tongue, as I was looking at the "free 3 year replacement" covering the entire side of the battery. He did all sorts of paperwork, went into the register and handed me $95. I told him I did not think I should be getting money back and tried to give it back to him. He explained that I paid more in NJ then they charge in AZ, and that along with the core charge - since I was returning a battery - came out to the $95. I was tired of trying to get it replaced I just took the money and new battery and left.