Fostex PD204 Owner's Manual page 171

<Example 3>: Batteries are mounted on both battery mounts and can be used continuously.
Power priority: BATT.
Active battery: BATT1 (You may select BATT1 or BATT2 whichever you like. Each time
[BATT1] indicator is lit.
[BATT2] indicator is lit.
BATT2 is active.
[BATT2] indicator is lit.
BATT2 is active.
[BATT1] indicator is lit.
BATT2
battery is
being
replaced.
(If no power is supplied to "DC-IN", this item has no effect.)
battery is replaced, the active battery automatically changes,
though you can manually select it.)
BATT2 is on
BATT1 is active.
standby.
BATT1 is active.
Chapter 8: MENU mode/BATTERY SETUP menu
Pop up window
BATT1
battery is
being
replaced.
BATT1
battery
replacement
finished.
Pop up window
Location Recorder Model PD204
Status information
display
Status information
display
Status information
display
Status information
display
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