MIL-B-8565 Revision J, July 1, 1987
BATTERY STORAGE, AIRCRAFT
This specification covers the general requirements for rechargeable storage batteries for use in aircraft. The batteries are nominal 24-volt batteries.
Batteries shall be classified as follows:
Type 1 Medium Rate Batteries generally used for medium current engine starting/utility applications, having non-removable covers, designed for maintenance-free operation. Type 2 High Rate Batteries generally used for high current engine start applications having removable covers to allow access for scheduled maintenance.
Part numbers for batteries furnished under this specification shall be as follows: D8565/X-Y with "X" being the specification sheet number and "Y" being any variation of the battery on a specific specification sheet.