User's Manual

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Appendix I: INS Battery Life
ThefollowingfourtablesestimateINSbatterylifeunderthegivenloadimpedanceconditions. 
Tables1through4listestimatedlongevitybasedon1‐leadstimul ation,active24hoursaday.Toestimate
longevityformultipleactiveleadsandtoaccountfordailyusage,usethefollo wingformula:
Where,
C2 =
Longevity for Lead 2 Settings
Daily Usage Lead 2
-35
3014
And,
DailyUsageLead1,2,3and4arefractionalvaluesequaltothenumberofhoursstimulationisenabledfor
eachleaddailydividedby24hours.
Note:DonotentervaluesforC1,C2,C3orC4forcorrespondingleadsthatareinactive.

Example:
Estimatelongevityfor2leadstimulationwithlead1settingsof0.8mA,40Hz,200µsacross600ohms
continuouslystimulating,andlead2settingsof1.0mA,60Hz,400µsacross1Kohmstimulatingfor16hours
perday.

FromTable1(600ohms),longevityforlead1settings=58.9months
FromTable
2(1Kohm),longevityforlead2settings=34.1mon ths
CalculatedC1=(3014/58.9–35)*(24/24)=16.2
CalculatedC2=(3014/34.1–35)*(16/24)=35.6

Estimatedlongevityforthisexample=3014/(16.2+35.6+
35)=34.7months