Dräger Evita V Series Supplement To The Instructions For Use page 15

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The charge status indicator is a relative indication which is based on the
electrochemical properties of the battery. The charge status indicator is evaluated
on the basis of a battery model.
The use of a model-based indication is a state-of-the-art technique which finds
application in many fields, e.g., computers, cellular phones, etc.
The model-based indication of battery charge takes account of the following
information, among other things:
– Type of battery (e.g., NiMH, VRLA, or LFP)
– Maximum capacity on delivery (e.g., 12 Ah)
– Age of the battery (e.g., new or 2 years)
– Capacity spent (irreversibly lost) over the utilization time (e.g., 1000 Ah)
– Device power consumption (e.g., 2.5 A)
– Discharging mode
– Charging mode
If the power consumption changes, e.g., due to switching to standby mode,
operation of a GS500 gas supply unit, or after adjusting the screen brightness, the
remaining battery runtime of the device also changes. The charge status indicator is
updated to take account of the power consumption.
In accordance with the specification, the charge status indicator is only displayed
and updated after the device has been completely started up. This procedure may
take a few minutes.
9.1.3 Battery ageing
The electrochemical composition of a battery alters as a result of ageing and
utilization. Consequently, every battery loses a proportion of its maximum capacity
when compared to the maximum capacity of the battery in its new condition. This
loss of capacity is typically irreversible.
As a result of ageing and utilization of the battery, there is a change in the actual
maximum battery runtime which cannot be displayed by the percentage values in
the charge status indicator. The percentage value refers to the battery charge,
which entails a different operating time depending on the age of the battery, for
example.
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Supplement
Evita V series / Babylog VN series
Battery charge
99 to 100 %
75 to 98 %
50 to 74 %
25 to 49 %
0 to 24 %, flashes red.
Batteries faulty or no information available on the battery charge.
Principles of operation
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