Hello all, I was wondering if someone knowledgeable about cars could answer this question for me. I've been Googling and researching but still wondering. My situation was: my 2010 car was having very weak cranking on a cold start (after engaging the key, the engine wouldn't start up right away, there would be a delay of a couple seconds after the key was fully engaged) that got worse over time. I suspected it was the battery, based on my research. The dealer service dept. stated my battery was in "good condition," yet when I took the car to a trusted independent mechanic, they said the battery was bad and to replace it. The mechanic gave me a printout of the battery test showing the voltage was 12.57v (apparently "normal"); however, a "capacity test" done showed the battery failed and the battery life was 0%. Recommendation: replace now (which I did).
My question is, do you think the dealer just didn't check my battery at all, or did they only possibly measure the voltage, and because they didn't do the "capacity test," they couldn't tell the battery was in bad shape or get a complete picture of its health? In other words, are some methods of battery testing not very comprehensive compared to others? Please let me know somebody as I'm trying to determine whether to return to the dealer service dept. in the future. If you think they f'd this up let me know. Thanks!!!