The J5019 (HW-357) UPS Boost & Charger Module is a versatile "all-in-one" power management solution. At Electrapac, we recommend this as the ultimate board for creating uninterruptible power supplies (UPS) for small electronics like routers, modems, and security cameras.

Product Overview

The J5019 combines two essential functions on a single tiny PCB: a Lithium Battery Charger (TP4056-based) and a DC-DC Step-Up Converter. This allows you to charge a 3.7V battery via USB while simultaneously boosting that battery power to a higher voltage (up to 27V) to run your project. If the USB power is disconnected, the module instantly switches to battery power without any interruption.

Key Features for Electrapac Customers

• Instant UPS Function: Perfect for "Always-On" devices. It manages the transition between USB power and battery power seamlessly.

• Wide Output Range: Use the precision trimpot to dial in common voltages like 5V, 9V, 12V, or even 24V from a single 3.7V cell.

• Multi-Battery Support: While optimized for 18650 Lithium cells, it can also charge and boost power from AA or AAA rechargeable battery packs (as long as they are 3.7V lithium-based).

• Dual Protection: Includes built-in charging protection to prevent overcharging your lithium batteries.

• Compact Integration: Eliminates the need for two separate boards (charger + booster), saving space in your enclosure.

Wiring & Setup Guide

To build a mini-UPS with your Electrapac module, follow these connection points:

1. Input (VIN+ / VIN-): Connect your 5V USB source or power adapter here.

2. Battery (BAT+ / BAT-): Connect your 3.7V Lithium battery (an 18650 cell).

3. Output (VOUT+ / VOUT-): Connect your load (the device you want to power).

4. Voltage Adjustment: Before connecting your load, use a multimeter on the VOUT pins and turn the potentiometer until you reach your target voltage (12V).

Pro Tip: To calculate the maximum output current, use the formula P = V x I. At 12V, you can typically draw about 0.5A to 0.7A} safely without overheating the module.

Primary Applications

• Mini UPS for Routers: Keep your Wi-Fi running during power outages by boosting a 3.7V battery to 9V or 12V.

• Portable Multimeters: Upgrading old 9V battery-operated tools to rechargeable lithium power.

• CCTV Backup: Ensuring security cameras stay active even if the main power lines are cut.

• Arduino/ESP32 Projects: Providing a stable 5V or 9V rail for long-term remote sensors.

• LED Emergency Lighting: Driving 12V LED strips from a rechargeable battery source.

Why Shop at Electrapac?

We source the J5019 / HW-357 with high-quality inductors to ensure the boost conversion is efficient and generates minimal heat. At www.electrapac.com, we provide the smart power modules that keep your world connected, even when the lights go out.