TP 4056 Without Battery Protection Lion Charging Module is best Suitable for charging Flat Lion Batteries which has battery protection circuits inbuilt and not recommended for 18650 Lion Batteries. Charging lion batteries from on board Micro-USB connector from USB or external +5V source like mobile charger etc. One can directly connect to computer USB port for battery charging. If USB is not available you can use a external source voltage at IN+/IN- pads Great for DIY projects.