Product Description Charging Method: Linear charge 1% Charging Current: 1A, Adjustable Charge Accuracy: 1.5% Input Voltage Range: 4.5V - 5.5V Full Charge Voltage: 4.2V Charging Indicator: Red when charging, green when fully charged Charging Input Interface: Mini USB Operating Temperature: -10°C to +85°C Reverse Protection: None Size: 25 x 19 x 10mm Important Notes Ampere meter should only be connected to the 5V input end of the module. It's recommended that the charging current be 37% of the battery capacity. For example, 400mA is sufficient for a 1000mAh battery. Avoid using excessively long connection wires for optimal performance. Ensure that the connection points are secure and stable. If the input voltage exceeds 5.2V, the charging current may reduce to less than 1000mA as a safety measure to protect the chip from damage. While input reversal will not affect the chip, reversing the output (battery terminals) may cause damage to the chip. Applications This module is designed for charging single or multi-section parallel lithium rechargeable batteries from a USB power source. Package Includes 3 x 1A Lithium Battery Charging Modules