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Apple Watch Series 7 review: 20 per cent more screen area, 40 per cent thinner, faster charging and long battery life – time for an upgrade? | South China Morning Post
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Apple Watch Series 4 Models Have Nearly 20% Less Battery Capacity Despite Same 'Up to 18 Hours' Battery Life - MacRumors
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Apple Watch Series 4 Teardown: 20% Less Battery Capacity, Hidden Barometric Sensor, and Streamlined Internals [Updated] - MacRumors
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