The module is suitable for two strings of 3.7V lithium batteriesBy short-circuiting, the default is 2 strings. When two strings are used, the module's built-in battery balancing function can be used, which is very practicalThe input can be TYPE-C port and welding wire. When the TYPE-C port is connected to a fast charging power source, the charging voltage is automatically adjusted to improve efficiencyIf the input voltage is less than the battery voltage when the welding wire is input, the module can only work in the boost stateOutput overcurrent, overvoltage, short circuit protectionSupports QC fast charging15W synchronous switch boost chargingBoost charging efficiency 94%Series balanced chargingCharging current adjustableInput overvoltage and undervoltage protectionAdjustable charging timeout protectionOutput overcurrent, overvoltage, short circuit protection(Due to different batches, the printed words on the product will be different, which does not affect use)Colour:BlackMaterial:PCBPackage Contents:5 x Lithium Battery Charging Boost ModuleOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.