i found this code on internet for charging state and tried to incorporate it in your skin but couldn't as i am a beginner. so gope you can incorporate this code in battery tracker.

[Rainmeter]
DynamicWindowSize=1

[MeasureBatteryPluggedIn]
Measure=Plugin
Plugin=PowerPlugin
PowerState=ACLine
Substitute="0":"On battery","1":"Plugged in"

[MeasureBatteryCharging]
Measure=Plugin
Plugin=PowerPlugin
PowerState=Status
Substitute="0":"no battery","1":"charging","2":"not charging","3":"not charging","4":"not charging"

[MeasureBatteryPercent]
Measure=Plugin
Plugin=PowerPlugin
PowerState=Percent

[String]
Meter=String
MeasureName=MeasureBatteryPluggedIn
MeasureName2=MeasureBatteryCharging
MeasureName3=MeasureBatteryPercent
Text=%1, %2. (%3%)
SolidColor=0,0,0,217
FontColor=255,255,255
FontSize=20
FontFace=Segoe UI
StringStyle=Bold
AntiAlias=1