EC Buying 3Pcs 1S 2S 3S 4S Lithium Battery Step Down Charging Module, DC-DC Buck Charging Management Board up to 3A 40W with Protection Circuit for Multi Cell Battery Packs

["This charging module supports lithium battery packs configured from one to four cells in series. It is suitable for different battery voltages and allows flexible use across multiple battery‑powered electronic applications and DIY power systems.","The module uses a buck (step‑down) charging architecture to reduce a higher DC input voltage to the appropriate charging voltage for lithium batteries. This design supports stable charging behavior within rated voltage and current limits.","Supports charging current up to approximately 3A with a maximum output power around 40W, depending on battery configuration and input voltage. Suitable for small to medium capacity lithium battery packs.","Built‑in protection circuits help manage over‑current, short circuit, over‑voltage, and over‑temperature conditions. These functions support safer charging operation and help protect connected batteries and power sources.","Compact PCB layout with clearly marked terminals simplifies wiring and installation. Suitable for embedded systems, portable devices, battery packs, and custom power management projects requiring multi鈥慶ell lithium charging support."]