This specification covers waterproof, lead-acid storage batteries, furnished in charged and dry or charged and wet conditions, for starting, lighting and ignition service in military vehicles.
Storage batteries covered by this specifications shall be of the following types and conditions, as specified (see 3.5 and 6.2).

                                       Rated capacity                                        at 20-hour rate         Type          Voltage          Ampere - hours          2HN             12                  45          4HN             24                  21        Condition           A - Charged and dry           B - Charged and wet

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: U.S. Army Tank-Automotive Command, ATTN: AMSTA-GLC, Warren, MI 48397-5000, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document, or by letter.
Intended Use: Batteries covered by this specification are intended primarily for starting, lighting, and ignition service in military vehicles, including tactical and administrative vehicles, internal combustion engine driven industrial trucks and tractors, construction equipment and generator sets. The batteries will also be used for radio operation and as a source of electrical energy for operating vehicular accessories, such as sighting devices and control mechanisms.