Lipo Battery monitoring Question

userHead Jim.Tallent 2024-05-13 10:05:48 209 Views1 Replies

I have a 3.7V Lipo Battery connected to my FireBeetle 2 ESP32 C6.  I am using the code sample provided in DfRobot tutorial:

https://wiki.dfrobot.com/SKU_DFR1075_FireBeetle_2_Board_ESP32_C6_Basic_Tutorial

 

Battery Details:

Brand:PKCELL

MPN:LP785060

Li-Ion

Voltage: 3.7 V

 

After reading the 12 bit analog value from the analog pin of the battery they use the following calculation:

 

Serial.print("BAT millivolts value = ");  

Serial.print(analogVolts * 2.1218 + 1000);  Serial.println("mV");

 

The mV output value is reporting numbers like:

BAT millivolts value = 5466.39mV

 

My Question: Is this calculation correct for all Lipo batteries?  A measurement of 5.5V for a 3.7V battery seems quite high.

 

 

2024-05-17 02:05:17

Additional Information about the issue: 

I unplugged the battery and ran the code again, its outputting the same as when the battery is connected: 5466.39mV (5.5V). I have also verified that the polarity of the battery is correct.

userHeadPic Jim.Tallent