TP4056 1A Li-Ion Battery Charging Board Micro USB with Current Protect This TP4056 5V 1A Lithium Battery Charging with Protection Micro USB can be used for voltage 3.6 3.7, etc. 18650 lithium polymer and other lithium battery charge and discharge protection. Specification : - Micro USB Interface - WITH IC PROTECTION - Input voltage: 5V - Charging cut-off voltage: 4.2V 1% - Maximum charge current: 1000mA - Battery over-discharge protection voltage: 2.5V - Battery overcurrent protection current: 3A - Board size: 17.2 mm x 27.55 mm