The J5019 HW-357 is a versatile 2-in-1 power management module. If you are building a project that needs to run on a battery but requires more than 3.7V (like a 9V motor or a 12V LED strip), this is your go-to board. It features a Micro-USB port for easy charging and a high-precision potentiometer to dial in your desired output voltage. Its the perfect foundation for creating portable multimeters, mini-UPS systems, or DIY power banks.
Dual Functionality: Integrates a lithium battery charging circuit and a DC-DC step-up (boost) converter on a single PCB.
Adjustable Output: Boost your battery voltage anywhere from 4.3V up to 27V DC.
Smart Charging: Includes the industry-standard TP4056 charging logic with LED status indicators (Red for charging, Green/Blue for full).
Ultra-Compact: Smaller than a postage stamp, making it easy to fit into tight enclosures or handheld devices.
High Efficiency: Modern boost circuitry ensures minimal energy loss during voltage conversion.
| Feature | Specification |
| Model | J5019 / HW-357 |
| Input Voltage | 4.5V to 8V DC (via Micro-USB or pads) |
| Output Voltage | 4.3V to 27V DC (Adjustable) |
| Charging Current | Max 1.0A |
| Discharge Current | Max 2.0A (depending on boost ratio) |
| Battery Compatibility | 3.7V / 4.2V Li-ion (18650, 21700, Li-Po) |
| Default Output | ~9V (can be adjusted via trimpot) |
| Dimensions | 33mm x 23mm |
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