You never said how old the battery is the average battery last 4 years so it could be just the battery. If you are really concerned take your car to an auto shop and have them run an electrical check and that will determine the exact problem as far as Optima batteries being worth the money if your not into alot of audio and sound save your money I have a Autozone battery in my car 40.00 dollars and still going strong after 3 years in my car.