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For maximum life of a standard 12-volt lead-acid battery, what is the lowest recommended discharge voltage?

About 10.5 volts.

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  1. 10.5 volts ✔
  2. 6 volts
  3. 8.5 volts

Why: Discharging a lead-acid battery too deeply shortens its life. For a standard 12-volt battery, the pool says to stop at about 10.5 volts.

Huh, didn't know that: A battery with low internal resistance can deliver a high discharge current.

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References

Answer: 10.5 volts. Discharging a lead-acid battery too deeply shortens its life. For a standard 12-volt battery, the pool says to stop at about 10.5 volts.

  1. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf
    10.5 volts
    Checked 2026-10-11.

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