The standards in this section apply to storage batteries of the lead-acid type and of the nickel - iron alkaline type. They are suitable for large and small batteries in either stationary or portable service. 36-2 These standards conform to accepted usage. CLASSIFICATION OF STORAGE BATTERIES 36-51 Storage batteries are classified as stationary or portable batteries on the basis of construction. 36-52 Stationary Batteries.--Are those designed for service in a permanent location. 36-53 Portable Batteries.--Are those designed for convenient transportation during service. Portable batteries may be used for service in a permanent location.