Dual USB 5V 1A 2.1A Power Bank 18650 Battery Charger PCB Power Module

The Dual USB 5V 1A 2.1A Power Bank 18650 Battery Charger PCB Power Module is a compact printed circuit board assembly intended for building or repairing portable power banks that use 18650 lithium-ion cells. The module provides two USB output ports rated at 5V with separate current levels (1A and 2.1A) so you can charge small devices and higher-draw devices from the same power source. It integrates battery charging and power-delivery functions on a single PCB to simplify integration into custom enclosures. This module is intended for use with one or more 18650 cells and includes the necessary USB output ports and charging interface typical of power bank designs. The board layout groups the charging circuitry, output regulation, and connector interfaces to facilitate wiring and mechanical installation. It is suitable for electronics hobbyists, technicians, and product designers who need a ready-made power-management board for portable battery packs. When installing the module, follow safe battery-handling and wiring practices: use good-quality 18650 cells, verify correct polarity, secure connections, and provide mechanical protection against short circuits and impacts. Observe manufacturer guidance for cell balancing, enclosure ventilation, and fuse or protection placement appropriate to your assembly. Compatibility and performance depend on the quality of the cells and the overall assembly, so test the completed unit under expected loads before regular use.