Warrior 18V to Bauer 20V Battery Adapter
Use your Warrior 18V batteries on Bauer 20V cordless tools, without buying into a second battery platform. Built with a durable 3D-printed ABS housing and pure copper contacts — light in the hand, accurate on the fit. This helps you get the most out of your existing battery system while avoiding the cost of another set of batteries and chargers.
Specifications
- SKU PTA-WAR18-BAU20
- Fits this battery Warrior 18V (Lithium-Ion) from Harbor Freight
- Battery voltage 18V
- Runs these tools Bauer 20V (Lithium-Ion) from Harbor Freight
- Tool voltage 20V
- Housing ABS (3D)
- 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 97 g (3.4 oz / 0.21 lb)
- Colour Black, Red
- 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 June 8, 2026)
Why choose this adapter
- 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 Warrior 18V 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.
Warrior 18V and Bauer 20V compatibility
It works in one direction only: Warrior batteries powering Bauer tools. For the opposite pairing, see adapters that run on Bauer 20V batteries.
Compatibility can vary with the exact battery and tool model. Before ordering, confirm that your battery belongs to the Warrior 18V platform and that your tool takes Bauer 20V batteries.
Important charging and safety information
This adapter is for powering cordless tools and nothing else. It cannot charge Warrior or Bauer 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 Warrior 18V battery.