No. Milwaukee and Craftsman batteries are not interchangeable, and this is one of the cleanest “no” answers on the site. Milwaukee is owned by Techtronic Industries, Craftsman by Stanley Black & Decker, so there is no shared parent company, no cross-brand licensing deal, and no official adapter connecting the two platforms.
What Milwaukee says about its own batteries
Milwaukee’s battery messaging is platform-only. The company’s Batteries and Chargers page states that “All M18 batteries are compatible with M18 tools and chargers” — nothing more, nothing less. Its “How to Choose a Milwaukee Tool Battery” guide adds that “M18 tools use M18 REDLITHIUM batteries rated at 18 volts,” and makes the broader rule explicit: “Batteries are not interchangeable across power tool systems, but are interchangeable within them.”
In other words, Milwaukee does not claim its packs fit anything outside the Milwaukee M18 family. The brand’s own language treats cross-system swapping as a non-starter. For a shopper, that means an M18 battery purchase is an investment that stays inside the Milwaukee ecosystem; it will not double as a power source for any Craftsman V20 tool.
What Craftsman says about its own batteries
Craftsman’s V20 System page says V20 batteries are “compatible with all the CRAFTSMAN V20 cordless power tool and outdoor tool lineup,” and notes that the system covers “over 100 different products.” A concrete example is the CMCD700C1 V20 1/2″ Drill/Driver Kit, which ships with “(1) V20 20V MAX* 1.3Ah Li-ion Battery.”
Like Milwaukee, Craftsman keeps the discussion inside its own ecosystem. Nowhere does Craftsman suggest its V20 packs power Milwaukee tools, or vice versa. The mention of “over 100 different products” simply reinforces that V20 batteries are designed for a broad Craftsman-only lineup, not as a universal power source.
Why there is no compatibility angle to untangle
Some battery pairings on this site require sorting through shared ownership or similar voltage branding. This is not one of them. Milwaukee and Craftsman have different parent companies, and neither brand’s platform pages mention the other. There is no common-ownership thread to pull, and Craftsman does not make the nominal-versus-peak voltage distinction that complicates certain other comparisons, so a voltage-class shortcut does not apply here either.
The situation is straightforward: M18 is Milwaukee’s proprietary 18-volt system, and V20 is Craftsman’s proprietary 20V MAX* system. They are designed, sold, and supported by two unrelated manufacturers. Without shared electronics, matching form factors, or a manufacturer-approved adapter, the physical and electrical barriers stay in place no matter how similar the tools may look on a shelf.
Practical takeaway
This is about as clean a “no” as this site can give — Milwaukee and Craftsman are made by unrelated companies, and neither brand’s own materials mention the other. There’s no shared-ownership confusion to sort through, no voltage-class coincidence worth dwelling on, just two separate proprietary systems. If you own tools from both brands, that means two full battery/charger sets, with no official adapter or bridge from either manufacturer. The only reliable way to keep both platforms running is to buy the correct battery and charger for each system and plan storage and budget accordingly.
How this was checked
Facts on this page are drawn from Milwaukee’s own Batteries and Chargers page and “How to Choose a Milwaukee Tool Battery” guide, plus Craftsman’s own V20 System and CMCD700C1 V20 1/2″ Drill/Driver Kit pages.
Sources checked: 2026-08-11. A new review date will only be set after the linked pages are re-checked.