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MIL-B-8565 Revision J, July 1, 1987
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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

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.