Milwaukee 18V to Ryobi 18V Battery Adapter

$34.90

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.