battery-balancer-dat
Method 1.
How to use single TP4056-dat to charge 2S lithium battery pack?
The battery should be built with all pins out:
parallel charging by TP4056-dat directly
Board looks like:
Method 2.
If building your own charger or pack, include a BMS, and use a charger with current limit and CV/CC behavior.
如果你自己DIY电池组或充电系统，务必使用保护板（BMS），并选择支持恒流恒压输出的充电器。