Same-brand adapter
DEWALT DCA1820 18V to 20V MAX Battery Adapter (Genuine)
Marketed to run dewalt-18v tools from a DeWalt 20V MAX battery.
Read this before you buy
- We have not tested this adapter for fit, safety, or performance — a working Amazon listing and buy button is not proof of any of those things.
- Even a genuine DeWalt adapter is a workaround: DeWalt does not warranty tool or battery damage that occurs while using an adapter, and it can complicate warranty claims on either the tool or the pack.
- Confirm your specific 18V tool's current draw before use; very high-draw tools (large saws, grinders) can stress an adapter differently than a drill or driver.
- A genuine same-platform battery (buying current 20V MAX tools instead of adapting old 18V ones) is always the lower-risk, fully-supported option.
- Verify the adapter's stated fitment (which 18V tool families, which 20V MAX battery models) against the current Amazon listing before buying — listings and packaging can change.
Our take
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.
Upsides
- Made by DeWalt itself, not a third-party clone, so the mechanical fit and contacts are engineered to DeWalt's own tolerances
- Lets you keep using older 18V XRP-era tools with newer 20V MAX batteries instead of retiring them
- Widely sold and reordered — not a fly-by-night listing
Risks & downsides
- Still an adapter, not native compatibility — DeWalt does not warranty tool/battery damage incurred while adapted
- Charger not included, so you need your own compatible charger for whichever battery you end up using
- Does nothing for you if your real goal is running new 20V MAX tools off an old 18V pack — this only goes 20V MAX battery to 18V tool
- We have not independently verified runtime, heat behavior, or long-term durability
BatteryFits earns a commission from qualifying Amazon purchases at no cost to you. A buying link is not proof of fit, safety, or performance — genuine same-platform batteries remain the safer choice.
Buy on AmazonListed around $39.99 — prices change.