Bauer 20V to RIDGID RED 18V Battery Adapter

Use your Bauer 20V batteries on RIDGID 18V RED cordless tools, without buying into a second battery platform. Constructed from durable molded ABS with pure copper contacts, for a secure fit and dependable current transfer. Fewer battery systems in the workshop, on the bench or in the van, and no extra chargers to find room for.

Specifications

• SKU PTA-BAU20-RED18
• Fits this battery Bauer 20V (Lithium-Ion) from Harbor Freight
• Battery voltage 20V
• Runs these tools RIDGID 18V RED (Lithium-Ion) from Home Depot
• 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 101 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 Yes
• What's in the box Battery adapter
• Warranty 12 months after the date of delivery
• Revision Revision 01 (released on February 28, 2026)

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.
• A USB port on the adapter, so the same battery charges a phone on site.
• 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 RIDGID 18V RED compatibility

It works in one direction only: Bauer batteries powering RIDGID tools. For the opposite pairing, see adapters that run on RIDGID 18V RED 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 RIDGID 18V RED batteries.

Important charging and safety information

This adapter is for powering cordless tools and nothing else. It cannot charge Bauer or RIDGID 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.

Before you buy