Bauer 20V to Milwaukee 18V Battery Adapter
Use your Bauer 20V batteries on Milwaukee M18 cordless tools, without buying into a second battery platform. Built with a durable injection-molded ABS housing and pure copper contacts for steady current delivery. A practical way to extend the value of the Bauer 20V batteries you already have.
Specifications
- SKU PTA-BAU20-MIL18
- Fits this battery Bauer 20V (Lithium-Ion) from Harbor Freight
- Battery voltage 20V
- Runs these tools Milwaukee M18 (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 102 g (3.6 oz / 0.22 lb)
- Colour Black
- Operating humidity 5–95% RH
- Operating temperature -10 °C to 50 °C (14 °F to 122 °F)
- USB port No
- What's in the box Battery adapter
- Warranty 12 months after the date of delivery
- Revision Revision 01 (released on October 26, 2021)
Why choose this adapter
- 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.
- Made for the Bauer 20V batteries sold at Harbor Freight, so the fit is the one you already own.
- Covered by a 12-month warranty from the day it arrives.
Bauer 20V and Milwaukee M18 compatibility
It works in one direction only: Bauer batteries powering Milwaukee tools. For the opposite pairing, see adapters that run on Milwaukee M18 batteries.
Compatibility can vary with the exact battery and tool model. Before ordering, confirm that your battery belongs to the Bauer 20V platform and that your tool takes Milwaukee M18 batteries.
Important charging and safety information
This adapter is for powering cordless tools and nothing else. It cannot charge Bauer 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 Bauer 20V battery.