RF Explorer User Manual
page 33
After the device recalibrates the internal battery charge reference level, it will automatically restart and you
should see the Battery icon (on Spectrum Analyzer screen) showing full charge.
Charging a fully depleted battery
The firmware includes a protection mechanism to shutdown everything if the battery goes too low, in the
range of 3.3V or less. However, this state will still keep drawing about 1mA from the battery. If you keep the
power switch to ON forever the battery will be depleted but limited to a safe 3V level where battery protection
circuitry will reduce the leakage to about 50uA.
In any case, the internal battery charger will take care of the battery conditions once it gets powered back
from the USB and will charge the battery using an internal efficient algorithm. For that to work properly when
the battery was fully depleted, you should use the Battery menu option as described.
Automatic idle mode with battery charge
As described in previous section, you should enable the Battery screen and keep it charging for the device to
automatically set internal circuits to Sleep for overnight charge.
Note: A more limited, equivalent functionality was available in old firmware versions prior to v1.16 in the
About screen, it has now moved to the new Battery screen. The About screen no longer sets the device to
sleep.
