Sennheiser EW 500 Manual page 72

Battery status indication
The red LED and the lower 8-segment bargraph on the display provide
information on the (remaining) battery capacity.
Bargraph:
The bargraph indicates the (remaining) battery capacity in 3 steps:
8 segments:
4 segments:
1 segment:
Note:
When switching on the transmitter with a partially used battery, it is
possible that all eight segments may show for a short period of time –
if this happens, re-check battery status after a few moments.
LED lit up:
The transmitter is switched on and the battery capacity is sufficient.
LED flashing:
The battery is going flat! You should immediately replace the battery!
Changing the microphone module
First remove the battery and leave the radiomicrophone open.
Unscrew the sound inlet basket.
Loosen the screw and put it aside.
Remove the microphone module, as shown. Do not touch the contacts!
Insert the new module, secure the capsule by tightening the screw,
put on the suitable sound inlet basket and coloured identification ring
and screw it tight.
Insert the battery, close the radiomicrophone and put it into operation.
Note:
Microphone module, sound inlet basket and foam insert form an
acoustic unit and must therefore always be exchanged all together.
Each microphone module comes with a colour-coded identification
ring to distinguish different microphone modules from each other
(green = MD 835, blue = MD 845, red = ME 865).
the full battery capacity is available,
the battery capacity is sufficient,
the battery is going flat,
immediately replace the battery.
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