Low Battery Monitoring for LiPo

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i want connect lipo battery analog input on arduino, i'm not sure if should connect through resistor or not?

lipo --> analog input
or
lipo --> resistor --> analog input

what guys recommend?
what pros , cons?

if talking less 5v can connect directly, recommend using series resistor , it's not bad idea add capacitor filtering. resistor few k ohms 100k should good.


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