When it is time to purchase a new Jaguar car battery, you are not limited to buying it from Jaguar. Many companies sell a variety of batteries that will fit your needs. If you are absolutely set on purchasing a battery from someone other than the dealer, then you must make sure that the battery is for your model and has the same specifications as the battery you are replacing. Pay close attention to the amperage to make sure that there is enough power not only to start your vehicle, but to satisfy the power needs of the vehicle’s accessories.