Supports 3V 1A voltage outputs. Supports 5V 2.2A voltage outputs. Micro USB charging current is 600mA-800mA. Supports up to two Li-ion batteries. It is recommended to use two 18650 batteries, which can be longer! The cell has to be 65mm. Special attention: the installation of the battery must be determined positive and negative, the board has been clearly marked positive and negative! Installation errors will burn out the module!