DC 5V 2.1A DIY Power Board 18650 Li-ion Charge Discharge Module
DC 5V 2.1A DIY Power Board 18650 Li-ion Charge Discharge Module
DC 5V 2.1A DIY Mobile Power Board — 18650 Li-ion Charge/Discharge Module
Take your electronics DIY projects to the next level with this versatile DC 5V 2.1A Mobile Power DIY Board. Designed for makers, hobbyists, and electronics enthusiasts, this all-in-one module handles charging, boosting, battery protection, and charge-level indication — everything you need to build your own custom power bank or portable power supply using a standard 3.7V 18650 lithium-ion cell.
Key Features
- All-in-One Functionality: Combines 4.2V lithium charging, boost discharge (5V output), battery protection circuit, and LED charge indicator in a single compact board.
- 5V 2.1A Output: Delivers a stable 5V/2.1A output — enough to charge smartphones, power microcontrollers, and drive other USB-powered devices.
- Compatible with 3.7V 18650 Cells: Works seamlessly with standard 3.7V 18650 lithium-ion batteries, one of the most widely available rechargeable cell formats for DIY builds.
- Built-in Battery Protection: Integrated overcharge, over-discharge, and short-circuit protection helps preserve battery longevity and keep your build safe.
- Charge Indicator: Onboard LED indicator lets you monitor charging status at a glance — no guesswork required.
- Compact & Breadboard-Friendly: Small form factor fits neatly into custom enclosures, prototyping setups, and wearable electronics projects.
- Packaged in Electrostatic Bag: Safely packaged to protect sensitive components during transit and storage.
Specifications
- Input Voltage: 5V DC (USB)
- Charge Voltage: 4.2V (for 3.7V Li-ion / 18650)
- Output Voltage: 5V (boosted)
- Output Current: 2.1A max
- Battery Compatibility: 3.7V 18650 Lithium-Ion
- Module Type: 5V Charge/Discharge Integrated Module
- Protection: Overcharge, over-discharge, short-circuit
- Package: Electrostatic anti-static bag
What's Included
- 1 × DC 5V 2.1A Mobile Power DIY Board (4.2V Charge/Discharge/Boost/Protection/Indicator Module)
Perfect For
- Custom portable power bank builds
- Arduino, Raspberry Pi, and microcontroller projects
- Wearable electronics and IoT prototypes
- Solar-charged battery systems
- Hobbyist electronics and maker labs
For more information on lithium-ion battery safety and best practices for DIY electronics, visit the U.S. Consumer Product Safety Commission (CPSC) Lithium-Ion Battery Safety Center.
Frequently Asked Questions
Q: What does this DC 5V 2.1A DIY power board do?
A: This all-in-one module integrates four functions on a single board: it charges a 3.7V 18650 lithium-ion battery up to 4.2V, boosts the battery's output back up to a stable 5V at up to 2.1A for powering external devices, provides built-in battery protection (overcharge, over-discharge, short circuit), and includes an LED indicator to display charging status. It's ideal for DIY power bank builds and portable electronics projects.
Q: Which battery type is compatible with this module?
A: This board is designed for use with standard 3.7V 18650 lithium-ion (Li-ion) rechargeable cells — one of the most common battery formats used in DIY electronics, flashlights, and portable power applications. It is not intended for use with other battery chemistries such as NiMH or LiPo without verifying compatibility.
Q: Can I use this board to charge my phone or power a microcontroller?
A: Yes. With a 5V/2.1A output, this module can charge most smartphones via USB and power popular microcontrollers like Arduino or Raspberry Pi. It effectively transforms an 18650 cell into a compact, rechargeable power supply suitable for a wide range of DIY and maker projects.
Q: How is the module protected during shipping?
A: The board is packaged in an electrostatic anti-static bag to protect sensitive electronic components from electrostatic discharge (ESD) damage during transit and storage.