CHoiKWong 18V to 12V Step Down Converter for Milwaukee M18 Battery — 240W Buck

Power a broad range of 12V devices from a Milwaukee M18 battery

CHoiKWong's 18V to 12V step-down converter combines a rugged battery adapter with a compact voltage regulator. It taps into Milwaukee M18 cells to deliver a steady 12V supply for compatible tools, lights, and gadgets, without relying on a separate charger.

Technical highlights: input 18–20V DC, output 12V DC, up to 20A (240W max). By using synchronous rectification, it achieves higher efficiency and stable performance under load, helping your devices run smoothly even when power demand fluctuates.

• Compatible with Milwaukee M18 batteries including models 48-11-1815, 48-11-1820, 48-11-1828, 48-11-1840, 48-11-1850, 48-11-1860 and more
• Smart protection: over-current, over-discharge, over-load, over-voltage, under-voltage, over-heat, and short-circuit safeguards
• Automatic low-voltage cut-off at 14.4V to help protect the battery and sensitive devices
• Two heat-resistant wires and an integrated switch for easy on/off control
• 1 x power adapter + voltage regulator, 3 x 30A fuses, 1 x wire terminals, 2 x screw fasteners

Ease of use: connect the battery to the adapter, then wire its output to your 12V device. The built-in switch lets you control power without disconnecting the battery, and the fuse provides an extra layer of protection against power surges. Note that this unit is not a charger; it outputs the voltage from your battery, not a charging current. For long periods of inactivity, remove the battery to prevent drain.

Common use cases

• Upgrade motors, ride-on toys, or power tools with a stable 12V supply
• Power work lights, LED strips, monitoring equipment, or small robotics projects
• DIY projects in garages, workshops, or outdoor environments where a compact 12V source helps

What you get is a compact, purpose-built solution designed to fit snugly with Milwaukee M18 packs and a variety of 12V devices. While it can deliver up to 240W, actual runtime depends on your battery capacity and the device you run.

Package contents

• 1 x power adapter+voltage regulator
• 3 x 30Amp fuses
• 1 x wire terminals
• 2 x screw fasteners

Important notes: not a charger; verify correct polarity before use; and if you won't use it for a long time, remove the battery from the adapter.