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

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:

 
Specification DeWalt 18V / 20V MAX
Battery Chemistry Lithium-Ion (Li-Ion)
Cell Configuration 5 cells in series (5S)
Nominal Voltage 18V (3.6V × 5 cells)
Maximum Voltage 20V (4.0V × 5 cells when fully charged)
  • 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.

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