dicodes Dani Box Micro - 05 Main Menu Operations (Page 3); Battery Status and Voltage Drop

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05MainMenu(Page3)
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.
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 voltagedropatthesystems
sourceresistance.Thebyfarbiggestpartofthe
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.
significant
voltagedropiscreatedINSIDEthebatteryandNOTin
thedevice.
Volt-drop
Power
Battery
resistance
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.
W W
W
Rb
dU