VOID Battery - Rainmeter

VOIDBattery.ini
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[Rainmeter]
Update=2000             ; Every 10 seconds
AccurateText=1
DynamicWindowSize=1
OnUpdateAction=[!CommandMeasure MeasureReadBattery "Run"]

[Metadata]
Name=
Author=
Information=
Version=
License=

[Variables]

[MeasureReadBattery]
Measure=Plugin
Plugin=RunCommand
Parameter=ReadBatteryLevel.exe
State=Hide

[MeasureBatteryLevel]
Measure=Script
ScriptFile=read_file.lua
IfCondition=(MeasureBatteryLevel >= 0) && (MeasureBatteryLevel <= 100)
IfTrueAction=[!SetOption MeterBatteryText Text "%1%"]
IfFalseAction=[!SetOption MeterBatteryText Text "N/A"]

[MeterBatteryText]
Meter=String
MeasureName=MeasureBatteryLevel
AntiAlias=1
FontColor=165,224,218
FontSize=16
FontFace=Century Gothic
StringAlign=Left
NumOfDecimals=0
AutoScale=1


read_file.lua
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function Update()
    FilePath = "./battery_level.txt"

    -- HANDLE RELATIVE PATH OPTIONS.
    FilePath = SKIN:MakePathAbsolute(FilePath)

    -- OPEN FILE.
    local File = io.open(FilePath)

    -- HANDLE ERROR OPENING FILE.
    if not File then
        print('ReadFile: unable to open file at ' .. FilePath)
        return
    end

    -- READ FILE CONTENTS AND CLOSE.
    local Contents = File:read('*all')
    File:close()

    return Contents
end