Hope someone can help me with this. I have a JT-BC204 battery pack from Jetech. It’s quite new but it won’t charge. So I charged it without using the bms. That worked but now when I measure on the connector it’s 16,86V while measuring directly on the battery it’s 28,3V.
The 18650 cells are connected in pairs and all pairs give 4,04V.
Somebody knows what can be the problem? Why there is so much difference between the battery and the BMS output?