DEWALT DCA1820 Battery Adapter 18V to 20V MAX – Use 20V Batteries in 18V Tools

Expand the versatility of your DEWALT toolbox

The DEWALT DCA1820 battery adapter lets you run select 20V MAX lithium‑ion batteries in most 18V DEWALT tools, including drills and sanders. This can help you extend runtime and simplify battery management on busy workdays, giving you more flexibility when switching between tasks.

Note that this adapter is sold as a standalone accessory and you will need a 20V MAX DEWALT charger to power the connected batteries. With the adapter in place, you can choose from a range of XR packs (1.5 Ah, 2.0 Ah, 3.0 Ah, 4.0 Ah, and 5.0 Ah) to tailor runtime to your project without changing tools.

Compatibility highlights

• Allows 20V MAX lithium‑ion batteries in most 18V DEWALT tools
• Requires a 20V MAX DEWALT charger for operation
• Not compatible with premium DC970 or DC759 batteries
• Not compatible with 20V/60V FLEXVOLT batteries
• Supports XR batteries in 1.5 Ah, 2.0 Ah, 3.0 Ah, 4.0 Ah, and 5.0 Ah sizes

Real‑world use cases

On a crowded jobsite, you can maximize uptime by pairing a 20V MAX battery with your 18V tool via the adapter. It’s useful when you have several tools sharing the same battery pool, or when you want to optimize weight and balance for longer tasks such as sanding or drilling.

Imagine swapping between a compact 20V MAX pack for light tasks and a higher‑capacity XR battery for torque‑heavy work—without swapping tools. The result is smoother transitions between steps in a workflow, with fewer interruptions to reach a charger.

Usage notes and best practices

• Always use a 20V MAX charger with the adapter installed
• Only use XR series 1.5–5.0 Ah 20V MAX batteries
• Avoid pairing with DC970 or DC759 premium batteries
• Do not use this adapter with FLEXVOLT 20V/60V packs
• Charger not included with the adapter package

With thoughtful use, the DCA1820 can help you stretch your battery options, reduce downtime, and keep your toolkit flexible across projects. It’s a practical accessory for hands‑on workers who value adaptability and efficiency on site.