Datalogic GRYPHON BT Reference Manual page 14

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Since it is not practical to wait for the reader to be fully discharged before recharging it,
the C-GRYPHON BT are provided with a battery-reconditioning feature which
overcomes the "memory effect" problem.
To perform battery reconditioning, simply press the battery-reconditioning key on the
cradle control panel: the battery will be fully discharged in a short period of time (red
LED flashing), then automatically recharged.
We recommend performing the battery reconditioning once every few months or
whenever you feel the battery capacity has decreased.
The LEDs positioned on the cradle signal the charge status, as described in the
following table:
LED
Yellow
Red
Green
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On = C-GRYPHON is powered.
Blinking = C-GRYPHON receives commands from the Host.
On = the battery charge is in progress.
On = the battery is completely charged.
STATUS
GRYPHON™ BT