Overview

The FNIRSI HS-03 is a truly cordless soldering iron built for electronics repair, DIY builds, and precision bench work. Powered by a removable 18650 Li-ion battery, it frees you from tangled cords so you can solder on a ladder, in a car, or anywhere a wall outlet is out of reach.

When the battery runs low, simply switch to USB-C power and keep working without interruption. A 0.96-inch IPS color screen and an advanced PID control chip give you stable, accurate heat from 212°F to 842°F, with fine 1°F adjustment for delicate SMD work.

Lightweight at around 134 g and ready to melt solder in about 7 seconds, the HS-03 is a compact, professional-grade tool for technicians, makers, and hobbyists alike.

Key Features

• Brand : FNIRSI
• Model : HS-03
• Item Type : Cordless Soldering Iron Kit
• Power : 10 W (Max)
• Temperature Range : 212–842°F (100–450°C)
• Battery : Removable 18650 Li-ion, 2600 mAh
• Charging : USB Type-C port, 5 V input
• Display : 0.96 in IPS HD color screen
• Supported Tips : K-Tip (knife blade)
• Net Weight : About 134 g

Highlights

• ✓ True cordless freedom thanks to a high-capacity replaceable 18650 battery
• ✓ Dual power modes let you switch between battery and USB-C power for uninterrupted work
• ✓ Fast heat-up melts solder in about 7 seconds
• ✓ Wide 212–842°F range handles delicate SMD joints and higher-temperature jobs
• ✓ PID temperature control chip keeps heat stable with 1°F precision adjustment

Usage

Ideal for circuit board repair, wire splicing, jewelry and craft work, and field maintenance where no outlet is available. The USB-C port also makes it easy to top up from a power bank, laptop, or car charger.

In the Box

• FNIRSI HS-03 cordless soldering iron
• 18650 Li-ion battery
• K-Tip soldering tip