Sorry if this is not the correct forum to ask… I have assembled my first 18650 pack, however I am facing some issues with it. Before assembling it, I measured all the cells voltage and they were around 4.12V, however, after having connected all the batteries in a 4s3p configuration, when I measure the pack voltage it is at 14.2V and the cells are at 3.56V and the BMS is therefore cutting the battery. If I measure the voltage of the parallel packs(from positive to negative on each cell), the voltage measured is again 4.12V.
I am using these samsung 25r cells
Any idea of what is happening here? Is there any problem in the connections or I just have to charge the complete pack? Since the individual cells were fully charged, I am afraid of over charging it.