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2.3.2.4 Charging the Lithium-ion Battery
The pulse oximeter is configured with a lithium-ion battery charging circuit which can detect
battery charging status and provide protection against overtime, overcurrent as well as
overtemperature charging. It automatically charges the battery in circle and enters into the
sleeping mode when the battery is fully charged. The system identifies battery type through
BC pole to avoid charging the alkaline batteries. The charge time to 90% capacity is less than
2 hours and to 100% capacity less than 3.5 hours.
2.3.2.5 Man-machine Interfaces
Button
To avoid pressing the Power button by accident, you have to press and hold it for 2
seconds when you need to turn off the pulse oximeter. However, to turn on the pulse
oximeter, just press it momentarily.
LED indicator
The Power Indicating lamp is a LED that lights green and yellow. It is located on the
main board. The status of the LED is specified as follows:
Green: when the pulse oximeter is plugged in the charger stand, and the AC
mains is connected, or when the battery is fully charged if a lithium
battery is used.
Yellow: when a lithium ion battery is used and is being charged.
Off: When the AC mains is not connected.
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