Hercules 20V to Bauer 20V Battery Adapter

Use your Hercules 20V batteries on Bauer 20V cordless tools, without buying into a second battery platform. Power passes straight through: Hercules 20V and Bauer 20V share the same 20V rating. The molded ABS housing keeps it light and hard-wearing, and pure copper contacts keep current delivery steady. 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-HER20-BAU20
• Fits this battery Hercules 20V (Lithium-Ion) from Harbor Freight
• Battery voltage 20V
• Runs these tools Bauer 20V (Lithium-Ion) from Harbor Freight
• Tool voltage 20V
• 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 130 g (4.6 oz / 0.29 lb)
• Colour 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 March 10, 2025)

Why choose this adapter

• Your Hercules 20V battery and Bauer 20V 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.
• Made for the Hercules 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.

Hercules 20V and Bauer 20V compatibility

It works in one direction only: Hercules 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 Hercules 20V 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 Hercules 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 Hercules 20V battery.