Car manufacturers generally recommend that car owners replace new batteries for motorcycles every year, but according to experience, the battery life of normal use can last for about 2 to 3 years. However, if you haven't been in the car for a long time, or forget to turn off the lights when you turn off the car and leave, the battery will be "dry pond". At this time, does it need to be recharged, or does the battery have to be replaced in full when it expires? Helmet King teaches you the easiest test method.