MIL-PRF-81757/1E
4.2 Add the following paragraph:
"3.7.11.9 Cell fasteners. Terminal screws, washers, and Belleville springs are not required
for cells that are procured separately from complete batteries. These items shall meet the
requirements of 3.10.2 and 3.10.19 (see 6.10.1). In addition, the tensile strength of the terminal
screws (PINs M81757/1-9 and M81757/1-10) shall be 130,000 20,000 pounds per square inch
(psi) as determined by subjecting the items to 4.5.31."
4.3 Modify the following paragraphs:
3.8.3.2 Cells. Insert as a new first sentence: "The cell's terminal polarity markings shall be
located as shown on figure 1 of the specification sheet."
3.8.5 Cell identification. Insert after the third sentence: "The cell's identification markings
shall be located as shown on figure 1 of the specification sheet."
4.4 Add the following paragraph:
"4.5.31 Head breakaway torque test for M81757/1-9 and M81757/1-10 terminal screws.
Secure the terminal screw's body in a fixed position and subject the terminal screw's head to a
torque not greater than 20 inch-pounds. Gradually increase the applied torque until the terminal
screw's head separates from the terminal screw's body. The applied torque (inch-pounds) at
separation (breakaway) shall comply with the head breakaway torque requirement specified in
3.7.11.9 and table IV of the specification sheet."
4.5 Modify the following paragraphs and table:
6.2.d Acquisition requirements. Insert after the first sentence: "Cells must be ordered in
multiples of 19 cells. Cells must be packaged in groups of exactly 19 cells. Each cell within a
19 cell group must be part of the same inspection lot and bear the same date/lot code (see 3.8.2).
Specify the MIL-PRF-81757/2 vented filler cap to be used (see 3.7.11.6 as modified herein)."
6.10.1 Corrosive nature of potassium hydroxide. Add as a new last sentence: "Components
manufactured from stainless steel 303 have passed the qualification tests in the past."
6.15 PIN supersession data. Delete text and substitute: "Cell PINs M81757/1-2,
M81757/1-4, and M81757/1-6 supersede the cells shown in tables IX and X."
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