Same-brand adapter
Aftermarket DCA1820-Style 18V to 20V MAX Battery Adapter (2-Pack)
Marketed to run dewalt-18v tools from a DeWalt 20V MAX battery.
Read this before you buy
- We have not tested this adapter — a working buy link and cheap price are not evidence it is safe, durable, or that it actually protects the battery or tool.
- This is an unofficial, third-party clone of the DeWalt DCA1820 design; DeWalt has no involvement in its manufacturing, and using it can void warranty coverage on both the 20V MAX battery and the 18V tool.
- Third-party adapters can bypass or ignore the battery's built-in protection circuitry, which is designed to prevent over-discharge, overheating, and cell damage — an adapter that doesn't pass that communication through correctly raises real risk.
- As a same-brand (DeWalt-to-DeWalt) adapter this is lower-risk than a cross-brand adapter, but it is still an unsupported workaround, not a supported accessory.
- A genuine DeWalt battery on a genuine DeWalt platform remains the safer default; verify seller, reviews, and current listing details before buying.
Our take
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.
Upsides
- Much cheaper than the genuine DeWalt adapter, and sold as a 2-pack
- Same basic function as the OEM version: lets an older 18V tool run on a 20V MAX battery
Risks & downsides
- Not made or endorsed by DeWalt — quality control, tolerances, and internal protection are unknown to us
- Can void warranty coverage on tool and/or battery
- No independent testing behind this listing that we can point to for safety or durability claims
- Low price can mean corners cut in the contacts or internal wiring — we simply don't know without teardown testing we haven't done
- If it fails, there's no manufacturer support chain the way there is with a genuine DeWalt part
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 $14.99 — prices change.