C-Rate

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The C rating of a battery is current relative to the amp-hour rating.

Examples
  • "1C" refers to a current rate that would charge or discharge the battery in 1 hour if applied constantly.
  • "4C" refers to a current rate that would charge or discharge the battery in 1/4 hour (15 minutes) if applied constantly.

Because a battery cell's voltage varies across its range of charge states, the way current is applied or available will differ through that range.