Lithium Power Bank Charger Module 5V 2.1A (18650 Boost)
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Prices updated: 13 Oct 2026
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About this product
A small PCB module that takes a single 3.2 to 4.2V lithium cell, such as a flat-top 18650 or a polymer pouch cell, and steps it up to a 5V USB output rated at 2.1A. It includes a charging circuit and a step-up (boost) converter, and is intended for DIY power bank builds and portable USB-powered projects. Size is about 72 x 17 x 8.6 mm.
Specifications
- Output voltage
- 5V
- Output current
- 2.1A
- Input battery voltage
- 3.2–4.2V
- Battery type
- 18650 flat-head or polymer lithium cell
- Dimensions
- 72 × 17 × 8.6 mm
- Topology
- Charging circuit + step-up boost
Frequently asked questions
Can I use two 18650 cells in series with this module?
No. The listed input is a single lithium cell at 3.2 to 4.2V.
How do I connect the battery?
Connect the cell's positive and negative terminals to the module's battery input, matching the polarity marked on the board, and confirm the wiring before powering it.
