Metabo 18V CAS to RIDGID RED 18V Battery Adapter

Use your Metabo CAS 18V batteries on RIDGID 18V RED cordless tools, without buying into a second battery platform. Voltage is not the obstacle here — both sides are 18V. The socket is, and that is what this solves. The molded ABS housing keeps it light and hard-wearing, and pure copper contacts keep current delivery steady. Your existing batteries do more work, and there is no second ecosystem to buy into.

Specifications

• Fits this battery Metabo CAS 18V (Lithium-Ion)
• Battery voltage 18V
• 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 113 g (4.0 oz / 0.25 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 12, 2025)

Why choose this adapter

• Your Metabo CAS 18V battery and RIDGID 18V RED 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.
• Covered by a 12-month warranty from the day it arrives.

Metabo CAS 18V and RIDGID 18V RED compatibility

It works in one direction only: Metabo CAS 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 Metabo CAS 18V 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 Metabo CAS 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 Metabo CAS 18V battery.

Before you buy