Updated July 2026. Prices verified from Amazon. Picks based on adapter compatibility , M18 to 20V cross-tool use, and avoiding overloads.
Running out of power is part of tool work. Running out of power because your M18 batteries don't fit your DeWalt tools shouldn't be. A battery adapter lets you tap into your existing battery fleet when a different brand tool is best for the job. These are not official converters. They are third-party adapters that physically connect one brand's battery to another brand's tool. They do not convert voltage or chemistry. Check compatibility. Avoid daisy chaining adapters. Some tools draw more current than others, and pushing M18 batteries through an adapter into a high-demand 20V DeWalt impact driver can cause overheating. Here are the top verified adapters for common cross-brand use cases.
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Specifications are sourced from manufacturer product pages. Verify current specs and prices before purchasing.
| Adapter | Price | Key Feature | Best For |
|---|---|---|---|
| EID DM18AR | $18 | Works with M18 and 20V Max batteries, compatible with Ridgid AEG tools | Best overall Milwaukee to DeWalt adapter |
| Kekepowtobat DM18D | $15 | Fits DeWalt 20V Max and Milwaukee M18 batteries, powers DeWalt old 18V XRP tools | Revive old DeWalt tools with modern batteries |
| LQ-18RY M18 to Porter Cable | $11 | Convert Milwaukee M18 to Porter Cable 20V MAX batteries | Porter Cable tool compatibility |
| Adapter Running Tools# M18 to Black & Decker | $17 | Fits M18 batteries on older Black+Decker 18v tools | Upgrade older Black and Decker tools |
| MT20DL | $17 | Convert Makita 18v batteries for use with DeWalt 18v-20v tools | Makita to DeWalt power transfer |
EID DM18AR adapter is designed to work with both Milwaukee 18V M18 and DeWalt 20V Max batteries, powering Ridgid and AEG tools. This adapter allows you to use your existing 18V M18 or 20V DeWalt batteries for your Ridgid 18V cordless tools. The adapter is not designed for charging so remove the battery and use the original charger for recharging. The ABS plastic housing provides wear and drop resistance while the copper pins ensure a stable connection. It's a cost-effective way to keep your tools running without buying new batteries.
Specs: Compatible with DeWalt 20V Max and Milwaukee 18V M18 batteries, works with Ridgid AEG 18V cordless tools, non-charging adapter, dimensions based on standard adapter size, ABS plastic body with copper contacts.
DM18D adapter allows DeWalt 20V Max or Milwaukee M18 lithium batteries to power DeWalt 18V XRP Ni-Cad and NiMh cordless tools. This adapter provides a seamless interface between the newer lithium batteries and the older 18V XRP series. The DM18D is constructed with high-quality ABS plastic and complies with FCC, RoHS, and CE safety standards. It extends the usability of your old tools by offering longer runtimes compared to older battery packs. Use compatible M18 18V or 20V DeWalt battery packs.
Specs: Dual compatibility with DeWalt 20V and Milwaukee 18V batteries, powers DeWalt 18V XRP tools, non-charging adapter, ABS plastic housing, dimensions standard for adapters, built to comply with FCC, RoHS, and CE standards.
The LQ-18RY adapter is designed for Milwaukee M18 users to upgrade their tools to be compatible with Porter Cable 20V MAX (not older 18V) and Black & Decker 20V MAX (not older 18V) batteries. The adapter features copper pins and a high-temperature silicone jacketed cable for durability. This is not compatible for charging and should be used with proper batteries. Confirm compatibility before use as older V18 tools and batteries are not supported.
Specs: Compatible with Milwaukee M18 tools, works with Porter Cable 20V MAX and Black & Decker 20V MAX batteries (excluding older versions), non-charging adapter, dimensions fit standard tools, copper pins with 14AWG silicone jacketed cable, ABS plastic housing.
Adapter allows Milwaukee M18 lithium batteries to power older 18v Black+Decker cordless tools. The top interface connects to Black+Decker tools while the bottom connector works with M18 batteries. This adapter does not have charging capability. Use M18 batteries such as 48-11-1813, 48-11-1815, 48-11-1840, or compatible M18 model numbers.
Specs: Fits Milwaukee M18 lithium batteries to power old Black+Decker 18v tools, non-charging adapter, ABS plastic body, dimensions suitable for cordless drill interface.
MT20DL adapter allows Makita 18v batteries to power DeWalt 18v-20v cordless power tools. This adapter enables cross-compatibility between different power tool systems to prevent having multiple batteries for different tools. The adapter is not designed to charge batteries. Compatible with DeWalt 18v-20v tools.
Specs: Compatible with Makita 18v battery to DeWalt 18v-20v tools, non-charging adapter, dimensions for standard connector, ABS plastic housing, does not support charging.
Select the EID DM18AR adapter if you specifically need to use Milwaukee M18 or DeWalt 20V Max batteries on Ridgid AEG tools. It is one of the top-rated options with consistent performance. Choose the Kekepowtobat DM18D to extend the life of older DeWalt 18V XRP tools by using new M18 or 20V lithium batteries, significantly improving runtime. Use the LQ-18RY adapter when you need to operate Milwaukee M18 tools with Porter Cable 20V MAX or Black & Decker 20V MAX batteries. The Adapter Running Tools# adapter is ideal for integrating Milwaukee M18 batteries into older Black+Decker tools, bringing new power to old gear. Consider the MT20DL if you have both Makita and DeWalt tools. Always verify that the adapter supports your specific tool and battery models. Do not use adapters to charge. Remove batteries and use original chargers. Avoid forcing adapters. Ensure proper connections to prevent short circuits or damage.
No. These adapters are not designed for charging. You must remove the battery and use the original charger. Attempting to charge through the adapter can damage the battery or the tool.
Adapters are generally compatible with standard M18 and 20V Max batteries, but verify your specific battery model. Some high-draw batteries or tools may cause issues. Check the product features for confirmed compatible models such as DCB203, 48-11-1820, etc.
If you use a quality adapter and match the batteries and tools appropriately, damage is unlikely. Ensure secure connections, never charge through the adapter, and stop use if overheating occurs.