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Most electronic devices state their battery life as 'mAh' (milliamp hour) rather than 'Wh' (watt hour). To calculate the Wh rating of a battery you multiply the mAh by the voltage before dividing by 1000.
e.g. a 2000mAh 5V battery provides 10Wh ((2000 x 5) / 1000 = 10)

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