How long is 4000mah battery life?
A 4000mAh battery life can last up to 4,000 hours, depending on the current required by the object being powered (measured in mA). You can calculate the battery life by dividing the capacity of the battery by the current required by the object. For example, if you have a 4000mAh battery and a phone that requires a current of 100mA, the battery can last up to 40 hours.
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