Milwaukee 18V to Milwaukee 12V Battery Adapter

Use your Milwaukee M18 batteries on Milwaukee M12 cordless tools, without buying into a second battery platform. Your Milwaukee M18 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. Built with a durable injection-molded ABS housing and pure copper contacts for steady current delivery. Fewer battery systems in the workshop, on the bench or in the van, and no extra chargers to find room for. It also carries battery protection electronics (BMS) inside.

Specifications

• SKU PTA-MIL18-MIL12
• Fits this battery Milwaukee M18 (Lithium-Ion)
• Battery voltage 18V
• Runs these tools Milwaukee M12 (Lithium-Ion)
• Tool voltage 12V
• Housing ABS (Injected)
• DC-DC converter Yes — 18V to 12V
• Terminals Copper
• Current rating 40A continuous (80A peak at 18VDC for up to 2 seconds)432 Watt continuous at 10.8V nominal
• Weight 140 g (4.9 oz / 0.31 lb)
• Dimensions (L × W × H) How It's Measured 110 × 70 × 114 mm (4.33 × 2.76 × 4.49 in)
• Colour Black, Red
• 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 September 25, 2023)

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.

Milwaukee M18 and Milwaukee M12 compatibility

It works in one direction only: Milwaukee 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 Milwaukee M18 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 Milwaukee 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 Milwaukee M18 battery.