0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0
10
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30
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50
60
70
80
90
0.02
0.025
0.03
0.04
0.05
05 Main Menu (Page 3)
Battery Status Part1
The Check Battery item shows the battery voltage with little current drained (Ub0) and
the battery voltage under load during the last puff (UbL). The difference is the voltage
drop of the battery (dU). A high drop (e.g. dU>0.4V@20W and dU>0.7V@60W) indicates
a poor battery and/or contact problems.
Please note that every battery has an inner resistance and that therefore the voltage at it’s contacts always
drops when current is drained. The more current is drained, the higher the drop will be. Always remember
this behaviour. Commonly used batteries of 18650 size have inner resistances of about 18m
up to
80m . Smaller sized batteries even have higher resistances. Generally speaking, the batteries with high
capacity have higher inner resistance and those with lower capacity also have lower inner resistance.
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Battery Status Part2
The Dani Box V2 and the Dani Box Mini now have 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.
When at the display menu item of Ub0 and UbL described above, the mod will display the system’s source
resistance Rb and a more accurate measurement of the voltdrop Ub, as soon as the values of Ub0 and UbL
are highlighted and the plus- or minus-button is pressed. Every time a button is pressed then, the display will
toggle between the values of Ub0/UbL and Rb/dU.
Note that these values might change a bit when toggling back and forth, because the battery voltage
without load (Ub0) can change, mainly due to the temperature change (cooling) after vaping.
The systems source resistance is the sum of the batteries inner resistance as the main contribution and all
contact and wiring resistances of the device. As already stated, typical battery resistances vary from 18m
to 80m
depending on the type. The typical contact and wiring resistance of the dicodes boxes sum up to
about 6m .
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At high power, the current drained from a battery will lead to a
voltage drop at the systems source
resistance. The by far biggest part of the voltage drop is created INSIDE the battery and NOT in the device.
Please keep this always in mind.
The diagram below shows the voltage drop depending on the source resistance 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 ouput power.
significant
V
olt
-dr
op
Power
Battery
resistance
