What’s the Difference Between DeWalt 18V and 20V MAX Batteries?

Short Answer: There is no technical difference.

DeWalt’s 18V and 20V MAX lithium-ion batteries are technically identical — they use the same battery cell configuration and deliver the same voltage under load.

Technical Breakdown:

• Nominal Voltage (18V): Actual working voltage during use.

• Max Voltage (20V): Voltage immediately after full charge, with no load.

  Why the Two Names Then?

  “20V MAX” is a marketing term used in North America, highlighting the max voltage.

  “18V” is used in Europe and other global markets, referencing nominal voltage (more common practice in technical standards).

  So:

  20V MAX ≈ 18V nominal — both refer to the same battery.