5V 2A Power Bank Charger Module DIY 18650 Boost Circuit Board

5V 1A/2A Power Bank Charger Module – DIY 18650 Step-Up Boost Charging Circuit Board

Build your own portable power bank with this compact and reliable 5V 1A/2A Power Bank Charger Module. Designed for DIY electronics enthusiasts, this step-up boost charging circuit board is compatible with standard 3.7V–4.2V lithium 18650 batteries and delivers a regulated 5V/2A output — perfect for powering USB devices on the go.

Key Specifications

• Input: DC 5V / 1A via Micro-USB (Android) interface
• Output: DC 5V / 2A (max)
• Compatible Battery Voltage: 3.7V – 4.2V lithium-ion (18650 cells)
• Battery Configuration: Parallel connection only (NOT series)
• Battery Terminals: B– (Negative) / B+ (Positive) clearly labeled
• Board Type: Step-up boost charging circuit
• Country of Origin: Made in Mainland China

Why Choose This Charging Module?

• ✅ Compact DIY Design — Ideal for custom power bank builds and electronics projects
• ✅ Step-Up Boost Technology — Efficiently converts 3.7V battery voltage up to stable 5V USB output
• ✅ 2A Fast Output — Charges smartphones and other USB devices quickly
• ✅ Standard Interface — Micro-USB (Android) input for easy charging compatibility
• ✅ Labeled Terminals — Clear B+ and B– markings simplify battery wiring

⚠️ Important Usage Notes

• Batteries must be connected in parallel, never in series.
• Always test each battery's voltage before installation — one faulty cell can affect the entire battery group.
• Double-check positive (+) and negative (–) polarity before connecting. Reversed polarity will permanently damage the onboard IC.
• Ensure all exposed wiring is properly insulated to prevent short circuits and protect the mainboard.

Package Contents

• 1× Lithium Battery Charger Circuit Board (18650 Step-Up Boost Module)

Helpful Resources

For guidance on safe handling of lithium-ion batteries and electronics, visit the U.S. Consumer Product Safety Commission – Lithium-Ion Battery Safety Information.

Note: Due to lighting conditions and monitor display settings, the actual product color may vary slightly from images shown. Please allow a 1–3 cm difference due to manual measurement.

Frequently Asked Questions

Q: How many 18650 batteries can I connect to this power bank charger module?

A: You can connect multiple 18650 lithium-ion cells to this module, but they must always be wired in parallel — never in series. Connecting batteries in series will damage the board's onboard IC. Always verify each battery's voltage before connecting and ensure correct B+ and B– polarity.

Q: What devices can I charge with the 5V 2A output of this module?

A: The 5V/2A USB output is compatible with most standard USB-charged devices including smartphones, Bluetooth earbuds, small tablets, and other low-to-mid power USB gadgets. It is ideal for DIY portable power bank projects using 18650 lithium cells.

Q: What input is required to charge the 18650 batteries through this module?

A: The module accepts a DC 5V / 1A input via a Micro-USB (Android) interface. Use a standard 5V USB wall adapter or power source connected through a Micro-USB cable to charge the connected 18650 batteries.

Q: Is this module safe to use for beginners in DIY electronics?

A: This module is designed for DIY use, but basic electronics knowledge is recommended. Always insulate exposed wiring, verify battery polarity, and test battery voltages before assembly to ensure safe and reliable operation of your power bank build.