Product Description:
The J5019 HW-357 Boost Converter Module is a compact and efficient DC-DC step-up (boost) power supply and charging module designed for 3.7V lithium battery (18650, AA, AAA) charging and regulated power output applications.
Equipped with an integrated TP4056 charging circuit, it supports battery charging and step-up conversion simultaneously, allowing you to build a compact UPS-style power system. Simply connect a 5V input (such as from a USB port or solar panel), and the board will charge your lithium battery while providing an adjustable output voltage between 4.3V and 27V.
Ideal for DIY electronics, solar charging systems, portable devices, and multimeter power supplies, this module ensures stable voltage regulation and battery protection in a small form factor.
Key Features:
All-in-one charging and boost solution for 3.7V lithium batteries (18650, 14500, AA, AAA, etc.)
Adjustable output voltage: 4.3V–27V DC (continuous adjustment)
Wide input range: 4.5V–8V DC
Built-in TP4056 lithium battery charger with 4.2V charging voltage
Supports solar or USB power input for off-grid charging setups
Compact UPS design enables charging and load operation simultaneously
Ideal for powering sensors, modules, and portable circuits requiring regulated voltage output
Overcurrent and over-discharge protection features for battery safety
Technical Specifications:
| Parameter | Specification |
|---|
| Model | J5019 / HW-357 |
| Input Voltage | 4.5V – 8V DC |
| Output Voltage | 4.3V – 27V DC (adjustable) |
| Charging Voltage | 4.2V DC |
| Charging Current | Max. 1A |
| Discharging Current | Max. 2A |
| Efficiency | Up to 93% (typical) |
| Dimensions | 33 × 23 × 10 mm |
| Working Mode | DC-DC Boost with Charging |
| Application IC | TP4056 + Boost Converter |
Applications:
3.7V Lithium Battery Charging and Step-Up Regulation
DIY Power Banks and Portable Power Supplies
UPS (Uninterruptible Power Supply) Modules
Solar-Powered Charging Systems
Multimeter or Sensor Power Conversion
Battery-Powered Arduino or IoT Projects
Package Includes:
How to Use:
Connect Input Power: Apply 5V (USB or solar panel) to VIN+ / VIN– terminals.
Connect Battery: Attach your 3.7V lithium cell to BAT+ / BAT– terminals.
Adjust Output: Use the onboard potentiometer to adjust the OUT+ / OUT– voltage between 4.3V and 27V.
Monitor Charging: The TP4056 controller will automatically manage charging and boost conversion.
Why Choose This Module?
The J5019 HW-357 combines charging and boost conversion into a single compact board, reducing the need for multiple circuits. With its adjustable voltage range, high efficiency, and built-in protection, it’s a reliable and flexible solution for powering DIY electronics, battery-based systems, and off-grid devices.
