Cross-brand adapter
DM18RL Cross-Brand Battery Adapter with USB & USB-C (2-Pack)
Marketed to run Ryobi ONE+ 18V tools from a DeWalt 20V MAX battery.
Read this before you buy
- The listing title names three battery/tool families at once (DeWalt 20V, Milwaukee 18V, and Ryobi 18V), so we cannot confirm from the title alone exactly which battery goes in and which tool platform it powers — verify the EXACT battery-to-tool direction on the current Amazon listing and product images before buying, not from our summary.
- We have not tested this adapter for fit, safety, or performance. A working buy link, USB ports, or a low price are not evidence of safety or compatibility.
- This is a cross-brand converter by design, unsupported by any of the manufacturers named on the listing; using it voids warranty coverage on whichever battery and tool you connect.
- Cross-brand adapters can bypass the tool's or battery's built-in protection and communication circuitry (over-discharge, overheating, overcurrent protection), which is a real fire and cell-damage risk if the adapter doesn't replicate that protection correctly.
- Genuine same-platform batteries remain the safer default; if you buy this, confirm your tool's voltage and current draw against the adapter's rated output before first use.
Our take
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.
Upsides
- Sold as a 2-pack, which lowers per-unit cost if you need more than one
- Adds USB and USB-C output ports, which can be handy for charging phones or small devices off a spare battery if that circuitry works as described
Risks & downsides
- Direction of battery-to-tool compatibility is ambiguous from the title alone and must be verified on the actual listing before purchase
- Cross-brand adapter spanning three different manufacturers' ecosystems — higher risk than any single-brand adapter
- Not endorsed or manufactured by DeWalt, Milwaukee, or Ryobi; using it voids warranty on all sides
- No independent testing behind the USB/USB-C output circuitry's safety or the adapter's core power-pass-through behavior
- Added electronics (USB regulators) are one more failure point compared to a simple mechanical adapter
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 $17.98 — prices change.