The dimensions of a Harley-Davidson motorcycle battery can vary depending on the specific model and year of the bike. There isn't a standard size that applies to all Harley-Davidson batteries. The size of the battery can depend on factors such as the engine displacement, electrical requirements, and design of the motorcycle.
To determine the exact dimensions of a battery for a specific Harley-Davidson model, it is recommended to consult the owner's manual or contact a Harley-Davidson dealership or authorized parts supplier. They will be able to provide you with the accurate dimensions and specifications of the battery that is compatible with your particular motorcycle model.