Makita 18V to 12V 240W Power Adapter – Buck Converter

Power 12V Devices from Your Makita 18V Battery

This compact buck converter adapter lets you tap into your existing Makita 18V lithium-ion battery to run 12V devices — including car fridges, portable coolers, and any accessory with a standard cigarette lighter socket. No car outlet needed. Perfect for job sites, camping trips, and off-grid use wherever your Makita batteries go.

Key Features

• Wide Compatibility: Designed for Makita 18V B-Series lithium batteries including BL1850B, BL1840B, BL1830B, BL1430B, and BL1820B
• High Output Power: Delivers up to 240W maximum output — enough to run a car fridge, LED lights, fans, or other 12V accessories
• Standard Cigarette Lighter Port: Built-in female cigarette lighter socket accepts virtually any 12V plug-in accessory
• Buck Converter Technology: Efficiently steps down 18V–21V DC input to stable 12V DC output (also adjustable 5V–13V DC)
• High Current Capacity: Maximum output current of 20A for stable, reliable power delivery
• Durable Plastic Housing: Lightweight and robust construction designed to handle demanding field conditions
• Plug-and-Play Design: Simply clip onto your Makita battery and you're ready to go — no wiring required

Specifications

Ideal Uses

• Powering portable car fridges and coolers on the job site or at camp
• Running 12V LED work lights and fans
• Charging devices via 12V car charger adapters
• Any 12V accessory you'd normally plug into a car's cigarette lighter outlet

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For more information on electrical safety standards for power tools and accessories, visit the U.S. Consumer Product Safety Commission (CPSC).

Learn more: Power tool

Frequently Asked Questions

Q: Which Makita 18V batteries are compatible with this power adapter?

A: This adapter is compatible with Makita 18V B-Series lithium batteries, including the BL1850B (197285-8), BL1840B (197270-1), BL1830B (197602-2), BL1430B (197618-7), and BL1820B (197487-6). It accepts input voltages from DC 18V to 21V.

Q: What devices can I power with this Makita 18V to 12V adapter?

A: You can power any device that uses a standard 12V cigarette lighter plug, such as portable car fridges, coolers, LED work lights, 12V fans, and car chargers — up to a maximum of 240W and 20A output.

Q: Can I adjust the output voltage on this buck converter?

A: Yes. In addition to the standard fixed 12V DC output, the adapter supports an adjustable output range of DC 5V–13V, giving you flexibility to power a wider range of accessories.

Q: Is this adapter safe to use with my Makita battery?

A: This adapter is designed specifically for Makita 18V B-Series batteries and features a plug-and-play clip-on connection. Always ensure the device you are powering does not exceed the 240W / 20A maximum output rating, and follow standard electrical safety practices. We recommend reviewing guidelines from the CPSC for safe use of electrical accessories.

Q: Do I need any tools or wiring to set up this adapter?

A: No tools or wiring are required. Simply attach the adapter to your compatible Makita 18V battery and plug your 12V device into the cigarette lighter port — it's that easy.