Milwaukee 18V to Ryobi 18V Battery Adapter

This adapter lets you power Ryobi 18V ONE+ cordless tools with the Milwaukee M18 batteries you already own. Power passes straight through: Milwaukee M18 and Ryobi 18V ONE+ share the same 18V rating. Built with a durable injection-molded ABS housing and pure copper contacts for steady current delivery. One battery platform across more tools means less spent on batteries and less to keep charged.

Specifications

• SKU PTA-MIL18-RYO18
• Fits this battery Milwaukee M18 (Lithium-Ion)
• Battery voltage 18V
• Runs these tools Ryobi 18V ONE+ (Lithium-Ion)
• Tool voltage 18V
• Housing ABS (Injected)
• Terminals Copper
• Current rating 40A continuous (80A peak at 18VDC for up to 2 seconds)720 Watt continuous at 18V nominal
• Internal wiring 5 mm²
• Weight 140 g (4.9 oz / 0.31 lb)
• Colour Black
• Operating humidity 5–95% RH
• Operating temperature -10 °C to 50 °C (14 °F to 122 °F)
• USB port Yes
• What's in the box Battery Adapter
• Warranty 12 months after the date of delivery
• Revision Revision 01 (released on October 9, 2021)

Why choose this adapter

• Your Milwaukee M18 battery and Ryobi 18V ONE+ tools run at the same voltage, so the adapter changes the fitting rather than converting anything.
• 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.
• 5 mm² internal wiring, 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.
• A USB port on the adapter, so the same battery charges a phone on site.
• Covered by a 12-month warranty from the day it arrives.

Milwaukee M18 and Ryobi 18V ONE+ compatibility

It works in one direction only: Milwaukee batteries powering Ryobi tools. For the opposite pairing, see adapters that run on Ryobi 18V ONE+ batteries.

Compatibility can vary with the exact battery and tool model. Before ordering, confirm that your battery belongs to the Milwaukee M18 platform and that your tool takes Ryobi 18V ONE+ batteries.

Important charging and safety information

This adapter is for powering cordless tools and nothing else. It cannot charge Milwaukee or Ryobi 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 Milwaukee M18 battery.