ski3pin
New Member
I have assembled my first DIY lithium 12v battery with 4 3.2V 120ah cells using xiaoxiang 4S 120A Li-ion BMS. I followed the overkill solar directions. I've top balanced successfully and then connected the BMS and final assembly. I have this issue - the cell voltage measures 13.6V at the cell terminals but through the BMS at the final terminals the voltage is 11.9V. The android BMS app confirms battery voltage is 13.6V. I've double checked the balance wires and overall assembly and can find nothing. What I'm I missing, what should I look for? I appreciate the help.