How long is 4000mah battery life?

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A 4000mAh battery life usually lasts for 4,000 hours. It depends on the object's required current (measured in mAh). You can calculate a more accurate duration by dividing the capacity of your chosen battery by the object's required current. For example, if you have a 4000mAh battery and a phone that requires 100mAh, it'll last 40 hours.

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