Battery level indicator with Arduino Mega

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hello guys,
i made gps tracking , logging device(logs data in sd card) using arduino mega, i've lithium ion single cell battery device supplying power, want measure battery voltage level of same battery, i'll add 3 leds device indicate 3 levels of remaining power.

i don't want connect battery positive supply analog or digital pin , measure.

i've seen few forums measuring voltage using internal reference(this helpful). how this.?

please help

thanks

quote
i don't want connect battery positive supply analog or digital pin , measure
why not ?



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