How long will a 5000mAh, 5V battery last with 2W usage?

Q. How long will a 5000mAh, 5V battery last with 2W usage?
Answer: 12.5 hours
Notes: 5000mAh = 5Ah; Energy = 5Ah × 5V = 25Wh. At 2W usage, Time = 25Wh ÷ 2W = 12.5 hours.

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