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Apple prefers to talk about battery life in hours rather than capacity, measured in milliamperes. As a result, the latest Watch Series 8 has a claimed life of 18 hours, just as its predecessor, and the new Watch Ultra has a claimed 36 hours.
And what are the actual numbers? Were you glad you asked, because this is something certification agencies are able to reveal, and this time its Chinas 3C agency, reported by GSMArena, that has come up with the goods.
According to the government, the smallest battery is compatible with the smallest Apple Watch model. Specifically, the new Watch SE has a battery capacity of 245 mAh in the 40mm model and 296 may in the 44mm version.
The Watch Series 8, which has a couple of slightly larger case options than the SE, which measures 41mm and 45mm, and these are compatible with Apple Watch''s Wi-Fi and LTE models, despite the latter being likely to be more power hungry than its non-4G sibling.
These figures are in effect down slightly against the Series 8s-year-old Series 7, which included a 309 mAh battery in the 41mm model.
Lastly, the new Apple Watch Ultra, which comes with its smaller case, has the most battery capacity ever connected to an Apple wearable, at 542 mAh. This makes it significantly larger than its stablemates, and it is no surprise, given the claimed battery life being three times the price of the Watch Series 8.
According to Apple, a new low-power mode, which will be introduced later this year for the new generation of smartwatches, can significantly increase battery life by scaling back and removing some features.
The manufacturer claims that the mode will prolong the Series 8''s battery life from 18 to 36 hours, while the Watch Ultras lifespan is up from 36 to 60 hours, claiming that it is a multi-day adventure involving 15 hours of exercise, 15 hours of sleep tracking, three minutes of voice calls, and more than 600 time checks.