I stopped at a Jiffy Lube to have oil changed on my 2000 Grand Cherokee V-8. They did a battery test, said the battery appeared to be 2.5 years old and was probably a 3 year warranty. Said it was supposed to put out (CCA I think) 820, and it was only putting out
760. According to the book they said the battery was bad and needed to be replaced.You think they were just trying to sell a battery, or do you think I really need one?