1/5pcs Type-C USB Input High Current 3A IP2312 Polymer Ternary Lithium Battery Quick Fast Charging Board CC/CV Mode 5V To 42V Product Description: Product name:3A polymer ternary lithium battery fast charging board (note that not suitable for 3.2V lithium iron phosphate batteries) Main control chip: IP2312 Input voltage: 4.5~5.5V Charging cut-off voltage: 4.2V/4.35V (output voltage has two versions to choose from) Charging current:3A(can change the current by adjusting the resistor)Indicator light:Yes, red:working indicator light. Blue: full indicator. Conversion efficiency:3A93%,2A94%,1A95%(data for reference only) Note: This product does not come with power indicator function, no battery protection function, (IP2312 adopts the complete CC/CV charging mode) Product Description: When the battery voltage is lower than 3V, it enters the trickle charge mode, charging the battery with 100mA charging current. When the battery voltage is greater than 3V, it enters the constant current charging mode, charging the battery with the set constant current charging current. When the battery voltage is close to 4.2V and the charging current is less than 300mA, it enters the constant voltage charging mode. After entering constant voltage charging mode, it stops charging after every 4 minutes and detects whether the battery voltage is higher than 4.15V:If it is higher than 4.15V, it stops charging; otherwise, it continues charging and then detects it after another 4 minutes. When the battery is full, if the battery voltage is detected to be lower than 4.1V, it will turn on to charge the battery again. Adjustment of current description. Default 3A, remove the resistor 2A, replace it with 135k resistor 1A.