Features: Charging / Discharging / Lithiums Batteries Protections Module. Lithiums batteries protections function: over-current, overvoltage, over-temperature, short circuits protections. Design specifically for 18650 lithiums batteries, it supports 3.7V and 4.2V charging needs while providing overcharge and over discharge protections to ensure battery longevity. Ideal for DIY enthusiasts and electronics hobbyists, this module caters to users who require reliable power solution for their projects. Perfect for use in portable powerbanks, electronic devices, and LED lighting, this module's compactly design allows for easy integration into various applications. With a high efficiency boost conversion technology, this module minimizes energy loss, making it excellent for those seekings sustainable and effective power solution. Specifications: Component:Plastic Size:Approx.25x16mm/0.98x0.62inch Charging voltages: DC4.5V-5.5V (DC5V recommended) Charging current: 0-2.1A Charging quiescent current: 100uA Full voltages: 4.2V+-1% Discharge current: 0-3.5A Discharge quiescent current: 50uA Option Type:Standard Version,Upgraded Version; Package Includes: 1pc Charge Discharge Integrated Module note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.