dicodes Dani Box Micro Manual - Halaman 7
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05 Main Menu (Page 3)
Commonly used batteries of 18650 size have inner resistances of about 18m up to 40m . Therefore,
the voltage at it's contacts always drops when current is drained. The more current is drained, the higher
the drop will be. The typical contact and wiring resistance of the Dani Box Micro sums up to about 6m .
The Dani Box Micro always shows the voltage with and without current drained at the right corner in the
bottom line of the screen ("V3.70/4.15" in the picture here). The lower value is the one measured at the
end of the last vape, the higher one is the idle voltage.
The Dani Box Micro has an additional feature supporting the user to evaluate the quality of the battery
and the system contacts on the battery side. This feature is gaining importance especially when vaping
at very high powers, i.e. between about 50-80W:
In the menu there is the display item of Rb (Resistance battery = total resistance at battery side) and dU
(delta Voltage = voltage drop or difference of voltage without and with current drained during vape).
Note "U" is the SI unit symbol of a voltage.
At high power, the current drained from a battery will lead to a
source resistance. The by far biggest part of the
the device.
Please keep this always in mind.
The diagram below shows the voltage drop dU depending on the source resistance Rb based on a
battery fully charged to 4.2V. When the battery is not fully charged the drop will increase even more,
because of the increasing current needed to provide the same output power.
dU
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0
10
Battery Status
Every battery has an inner resistance. This resistance depends on its
construction and chemistry. As a rule of thumb: The higher the capacity
the higher the inner resistance and vice versa.
20
30
40
significant
voltage drop is created INSIDE the battery and NOT in
50
60
W
W
voltage drop at the systems
Power
70
80
90
W
0.02
0.025
0.03
0.04
0.05
Battery
resistance
Rb