Ryobi 18V to Milwaukee 12V Battery Adapter

Use your Ryobi 18V ONE+ batteries on Milwaukee M12 cordless tools, without buying into a second battery platform. Your Ryobi 18V ONE+ battery is 18V where Milwaukee M12 tools expect 12V. A DC-DC converter inside steps it down and holds it there, so the tool never sees more than it is built for. The molded ABS housing keeps it light and hard-wearing, and pure copper contacts keep current delivery steady. A practical way to extend the value of the Ryobi 18V ONE+ batteries you already have. It also carries battery protection electronics (BMS) inside.

Specifications

• SKU PTA-RYO18-MIL12
• Fits this battery Ryobi 18V ONE+ (Lithium-Ion)
• Battery voltage 18V
• Runs these tools Milwaukee M12 (Lithium-Ion)
• Tool voltage 12V
• Housing ABS (Injected)
• Terminals Copper
• Current rating 40A continuous (80A peak at 18VDC for up to 2 seconds)432 Watt continuous at 10.8V nominal
• Weight 201 g (7.1 oz / 0.44 lb)
• Colour Black
• Operating humidity 5–95% RH
• Operating temperature -10 °C to 50 °C (14 °F to 122 °F)
• USB port No
• Built-in BMS protection Yes
• What's in the box Battery adapter
• Warranty 12 months after the date of delivery
• Revision Revision 01 (released on May 1, 2024)

Why choose this adapter

• A Battery Management System inside the adapter cuts power before the battery is drained too far — protection your battery may not have on its own.
• Injection-moulded ABS, not 3D printed — no layer lines to split under load.
• Solid copper terminals, so less of the current is lost as heat.
• Rated for 40A continuous with 80A peak at 18VDC for up to 2 seconds, so a high-draw tool is not held back by the adapter.
• Covered by a 12-month warranty from the day it arrives.

Ryobi 18V ONE+ and Milwaukee M12 compatibility

It works in one direction only: Ryobi batteries powering Milwaukee tools. For the opposite pairing, see adapters that run on Milwaukee M12 batteries.

Compatibility can vary with the exact battery and tool model. Before ordering, confirm that your battery belongs to the Ryobi 18V ONE+ platform and that your tool takes Milwaukee M12 batteries.

Important charging and safety information

This adapter is for powering cordless tools and nothing else. It cannot charge Ryobi or Milwaukee batteries and must never be connected to a charger of any kind. Always take the battery out of the adapter before charging, and charge it on the original charger made for your Ryobi 18V ONE+ battery.