Storage Charge Voltage Calculator

Putting packs away for winter? Store them part-charged.

Uses a typical storage range of about 3.6 to 3.85V per lithium-ion cell. Check the maker's advice first. 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

    • Many tool packs have no way to set a storage charge. Using a fresh pack for a short time after charging gets it close.
    • Store cool and dry, away from anything flammable.
    • 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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