Battery adapters
Battery adapters promise to run one platform's tools off another's packs. Some are genuinely useful (same-brand, older-to-newer); many are cross-brand workarounds that void warranties and carry real safety risk. We have not tested these — this is an honest map of what they claim and what to watch for.
- Same-brand
DEWALT DCA1820 18V to 20V MAX Battery Adapter (Genuine)
DeWalt 20V MAX battery → dewalt-18v tools
This is the genuine DeWalt-made version of the classic 18V-to-20V adapter, and being OEM lowers (but does not eliminate) the usual adapter risk. We have not tested it ourselves. If you can instead just buy a current 20V MAX tool and skip the adapter entirely, that remains the safer, fully-supported default.
- Same-brandAftermarket
Aftermarket DCA1820-Style 18V to 20V MAX Battery Adapter (2-Pack)
DeWalt 20V MAX battery → dewalt-18v tools
A budget clone of the DCA1820 adapter design. Same-brand adapters like this are generally lower-risk than cross-brand ones, but this is still an unverified third-party part with no OEM backing. We have not tested it for safety or performance. Genuine DeWalt batteries and tools remain the safer, warranty-protected choice.
- Cross-brandAftermarket
ZLWAWAOL MIL18DL Milwaukee M18 to DeWalt 20V MAX Battery Adapter
Milwaukee M18 / M18 FUEL battery → DeWalt 20V MAX tools
A cross-brand adapter bridging Milwaukee M18 batteries to DeWalt 20V MAX tools — a fundamentally higher-risk category than same-brand adapters. We have not verified its safety or performance, and neither Milwaukee nor DeWalt supports this use. Sticking with genuine same-platform batteries is the safer default; treat this as a convenience trade-off, not a verified-safe purchase.
- Cross-brandAftermarket
DM18RL Cross-Brand Battery Adapter with USB & USB-C (2-Pack)
DeWalt 20V MAX battery → Ryobi ONE+ 18V tools
A cross-brand adapter whose exact battery-to-tool direction is not unambiguous from the title — confirm the precise direction on the Amazon listing before buying. Regardless of direction, this is an unsupported, untested-by-us, multi-brand workaround with real warranty and safety trade-offs. Genuine same-platform batteries remain the safer, verified default.