18V vs 20V Max Label Check Calculator

Same cells, different number on the label.

Most tool packs use lithium-ion cells at about 3.6V nominal and 4.2V full. Everything is worked out in your browser. Nothing is saved or sent anywhere.

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How it was worked out

    What this does and doesn't tell you

    • Some cells are rated 3.7V nominal. The label voltage is a naming choice as much as a measurement.
    • Lithium-ion tool packs can short, overheat and catch fire if they're damaged, wired wrongly or charged on the wrong charger. Only use the maker's charger for the pack.
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