Trying to read the voltage from a 3.7V lipo Battery, using Arduino Nano

This is my first project using a micro-controller. Im trying to build a battery indicator for the 3.7V lipo battery using the 3.3V reference voltage from the Arduino Nano. I was able to get it to work with the 1.1V reference voltage but i need to change to 3.3V so it would compatible with some other measure component that my friend is working with using the 3.3V reference voltage. I dont know how to go about this with the 3.3V. I tried to build a voltage divider ( with 10200 ohms and 4300 ohms resistors) so the board can measure voltage larger than 3.3V that supplies from the battery to the analogpin A0 but the reading voltages were off.
Thank you