MIL-PRF-49471/7A(CR)
METHODS OF EXAMINATION AND TESTS:
Capacity tests:
(1) Storage:
Details on storage conditions for all specified capacity tests are described in the
basic specification (see 4.8.9).
(2) Discharge:
o
Cells (forced discharge): Two cells shall be discharged at 0.8 amperes at 70+5 F
to 2.0 volts. Each discharged cell shall then be connected in series to four fresh
o
cells. Each string shall be discharged at 0.8 amperes at 70+5 F for 3.6 hours.
Batteries: For all capacity tests except the LR1, the batteries shall be discharged
at 0.8 amperes constant current to cut-off volts (zero volts for the I test)..For the
LR1 test, batteries shall be discharged at 65 milliamperes to 11.25 volts followed
by 1.1 watts to 1.5 volts.
Forced Discharge: After discharge to zero volts on the I capacity test, the batteries
shall be force discharged at 0.8 amperes for a minimum of 10 minutes.
Overload test: Batteries shall be discharged at 1.6 amperes.
Abuse test, predischarge: Designated samples shall be discharged at 0.8 amperes
for 1.8 hours.
Abuse test, pulse discharge: Batteries shall be discharged at 1.0 amperes for 1
minute followed by 0.72 amperes for 4 minutes, cycled continuously to cut-off
voltage.
Closed-circuit voltage (batteries and cell strings): Load resistance of 13.75 ohms shall be used
between terminals. Voltage shall be above 11.00 volts within 10 seconds.
Cell closed circuit voltage: Load resistance of 2.5 ohms shall be used. Voltage shall be above
2.2 volts within 5 seconds.
Marginal notations are not used in this revision to identify changes with respect to the previous
issue due to the extent of the changes.
Custodian:
Preparing Activity:
Army - CR
Army - CR
(Project 6135-0417-07)
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