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100 Discharge current 150 mA upper 50 hours Aeronautics alkaline battery cells alkaline cells altitude Amplitude modulation capacity increases approximately capacity test capacity to 0.9 cell capacity decreases cell characterization tests cell voltage cells after isothermal cells from manufacturer cells tested charge voltage curves current is decreased current of 30 decreased from 0°C discharge rate discharge to 0.9 DPCA duty cycle effect on cell effective radiated power effects of temperature effects of thermal ELT/Battery Tests Emergency Locator Transmitters exposure five cells five tempera five-cell sets four constant-current loads input voltage Isothermal 20 40 isothermal testing Langley Research Center latch load circuit load conditions load current limited open-circuit voltage operation of ELT's perature percent plots of capacity rapidly below 0°C rechecked at room RF power RTCA selected ELT shown in figure temperature and load temperature chamber temperature on cell Test Results Thermal Vent Test vented at temperatures voltage sag