This product is widely used in product development, student experiments, maintenance, production, etc.
MINI USB input terminal with a female, can be directly input to do with the phone charger rechargeable lithium battery, And still retains the input voltage wiring pads, can be very convenient DIY.
It can be used for voltage 3.6 3.7V, etc. 18650, polymer and other lithium battery charge and discharge protection.