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I assume you're assking about a 4Ah(ampere-hour) battery.

How long it'll last depends on the drain.

If the drain is 1A it'll last 4 hours.

  • 0.5 A, 8 hours
  • 2A, 2 hours
  • etc, etc
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6y ago
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Q: How long a 4A battery can use?
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