<p>Use your RIDGID 18V batteries on Metabo CAS 18V 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. Constructed from 3D-printed ABS with pure copper contacts, for an accurate fit and dependable current transfer. It is a cost-effective way to get more from the batteries you have, with no second charger to maintain.</p> <h2>Specifications</h2> <ul> <li> <b>SKU</b> PTA-RID18-MET18</li> <li> <b>Fits this battery</b> RIDGID 18V (Lithium-Ion) from Home Depot</li> <li> <b>Battery voltage</b> 18V</li> <li> <b>Runs these tools</b> Metabo CAS 18V (Lithium-Ion)</li> <li> <b>Tool voltage</b> 18V</li> <li> <b>Housing</b> ABS (3D)</li> <li> <b>Terminals</b> Copper</li> <li> <b>Current rating</b> 40A continuous (80A peak at 18VDC for up to 2 seconds)720 Watt continuous at 18V nominal</li> <li> <b>Internal wiring</b> 5 mm²</li> <li> <b>Weight</b> 78 g (2.8 oz / 0.17 lb)</li> <li> <b>Colour</b> Black</li> <li> <b>Operating humidity</b> 5–95% RH</li> <li> <b>Operating temperature</b> -10 °C to 50 °C (14 °F to 122 °F)</li> <li> <b>USB port</b> No</li> <li> <b>What's in the box</b> Battery Adapter</li> <li> <b>Warranty</b> 12 months after the date of delivery</li> <li> <b>Revision</b> Revision 01 (released on August 20, 2026)</li> </ul> <h2>Why choose this adapter</h2> <ul> <li>Your RIDGID 18V battery and Metabo CAS 18V tools run at the same voltage, so the adapter changes the fitting rather than converting anything.</li> <li>Solid copper terminals, so less of the current is lost as heat.</li> <li>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.</li> <li>Made for the RIDGID 18V batteries sold at Home Depot, so the fit is the one you already own.</li> <li>Covered by a 12-month warranty from the day it arrives.</li> </ul> <h2>RIDGID 18V and Metabo CAS 18V compatibility</h2> <p>It works in one direction only: RIDGID batteries powering Metabo CAS tools. For the opposite pairing, see <a href="https://powertoolsadapters.com/collections/metabo-cas-battery-adapters?filter.p.m.version2.battery_brand=gid%3A%2F%2Fshopify%2FMetaobject%2F259848634609" data-pta-action="reverse_click" data-pta-surface="reverse_longform" data-pta-label="Metabo CAS 18V">adapters that run on Metabo CAS 18V batteries</a>.</p> <p>Compatibility can vary with the exact battery and tool model. Before ordering, confirm that your battery belongs to the <a href="https://powertoolsadapters.com/collections/ridgid-battery-adapters?filter.p.m.version2.battery_brand=gid%3A%2F%2Fshopify%2FMetaobject%2F259847946481">RIDGID 18V</a> platform and that your tool takes <a href="https://powertoolsadapters.com/collections/metabo-cas-battery-adapters?filter.p.m.version2.tool_brand=gid%3A%2F%2Fshopify%2FMetaobject%2F259848634609">Metabo CAS 18V</a> batteries.</p> <h2>Important charging and safety information</h2> <p>This adapter is for powering cordless tools and nothing else. It cannot charge RIDGID or Metabo CAS 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 RIDGID 18V battery.</p> <h2>Before you buy</h2><div> <h3>RIDGID 18V batteries</h3> <ul><li> Not compatible with RIDGID Red 18V (plumbing) batteries / tools </li></ul> </div><div> <h3>Metabo CAS 18V tools</h3> <ul> <li> Not compatible with most Metabo CAS circular saws and miter saws. </li> <li> Not compatible with Metabo CAS BP 18 LTX BL. </li> <li> Not compatible with Metabo HPT tools. </li> </ul> </div>