This 5V power bank PCB module is a compact all-in-one solution for building a DIY portable USB power source using a single 18650 Li‑ion cell (1S). The board integrates two critical functions: a battery charging section that accepts 5V input through a Micro USB connector, and a step-up (boost) converter that raises the battery voltage (typically 3.0–4.2V depending on state of charge) to a regulated 5V output on a USB-A port. It is intended for makers who need a small, ready-to-wire power subsystem for prototypes, handheld devices, and low-power embedded electronics.
This 5V power bank PCB module is a compact all-in-one solution for building a DIY portable USB power source using a single 18650 Li‑ion cell (1S). The board integrates two critical functions: a battery charging section that accepts 5V input through a Micro USB connector, and a step-up (boost) converter that raises the battery voltage (typically 3.0–4.2V depending on state of charge) to a regulated 5V output on a USB-A port. It is intended for makers who need a small, ready-to-wire power subsystem for prototypes, handheld devices, and low-power embedded electronics.
The module combines a Li‑ion charge controller and a switching boost regulator on one PCB. When a 5V source is connected to the Micro USB input, the charging circuit manages the battery charge profile appropriate for 1-cell lithium chemistry (exact algorithm and charge termination behavior vary by module revision—check the controller IC datasheet if identified on your board). The boost stage uses an onboard inductor and switching controller to convert the battery’s variable voltage to a stable 5V rail suitable for USB-powered loads.
The USB-A output is designed to supply 5V to external devices. While the product name references 5V 1A, real-world continuous current depends on factors such as battery internal resistance, cable quality, PCB copper, ambient temperature, and the specific IC revision used. For reliable operation, treat 1A as an upper bound and validate under your load profile. Voltage drop under high load can occur if the battery is low or the module is thermally constrained.
Battery connection is made via clearly labeled solder pads (typically B+ and B-). Correct polarity is essential; reverse connection can damage the module and battery. Many boards of this class also include basic protection features (overcharge/overdischarge/overcurrent) depending on the controller and protection IC used; because protection implementation differs across similar-looking modules, confirm by inspecting the PCB markings and IC part numbers or by testing.
1x 5V Power Bank PCB Module (18650 charging + boost board)
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