I am trying to set up a balance charger for 3S 11.1V LiPo battery using cheap components. I have a PC power supply and several TP4056 modules.
However, there seems to be something wrong with the circuit attached. I have noticed that everyone on youtube uses isolated power sources for each TP4056 module. Why is this? Does it apply even if my power source can handle enough wattage?
When I did this, the diode or transistors on the TP4056 closest to ground caught fire. I don't understand what's wrong about my reasoning.
Also, can I safely use these modules for charging 3.7V batteries even though they each output 4.2V?