MIL-B-18F
4.6.1.1.2 Contract lot. The contract lot (N) is the total quantity of all batteries (exclusive of the number of batteries
required as test sample units) of any one type, delivered in one or more shipment lots, under the terms of any one
contract.
4.6.1.2 Group A inspection. Group A inspection shall consist of 100 percent inspection of all batteries in a
shipment lot in accordance with the examination and test in table IV. If, during this 100 percent inspection, more than
4 percent of the batteries are discarded, the entire lot shall be rejected.
TABLE IV. Group A inspection.
Requirement
Method of test
Examination or test
paragraph
paragraph
Visual and mechanical (external)
Battery voltage
4.6.1.3 Group B inspection. Group B inspection shall consist of the examinations and tests specified in table V in
the order shown, and shall be made on sample units from inspection lots which have passed group A inspection.
4.6.1.3.1 Sampling plan. Group B inspection shall be on an inspection lot basis. Samples shall be selected in
accordance with table Vl, based on the inspection lot. If there are one or more failures, the inspection lot shall be
considered to have failed.
TABLE V. Group B inspection.
Sample size
Examination or tests
Requirement
Method of test
paragraph
paragraph
Dimensions and weight
A
Insulation resistance
A
Vibration 1/
B
Mechanical shock 1/
C
Battery voltage
A
Jacket integrity 1/ 2/
B
Electrolyte leakage
D
1/ When applicable.
2/ Batteries shall be selected at random during the first ten (10) days of the monthly production lot.
4.6.1.4 Group C inspection. Group C inspection shall consist of the tests specified by table VII in the order shown.
The tests shall be performed at the applicable Government inspection facility (see 6.2e). Shipment of the lot,
represented by group C sample batteries, shall not be held up pending results of group C inspection.
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