蘋果最近 iPhone XS/XS Max/XR 智慧型電池護殼 (Smart Battery Case) ，為手機提供額外的電力，但是在保護殼內裡有關電量的文字，卻引發一連串有關 iPhone XS 智慧型電池護殼電量的爭論。
事緣 Nick Guy 在 Twitter 分享了他的發現，說在 iPhone XS 智慧型電池護殼內發現電池的數據，發現 iPhone XS 智慧型電池護殼的電量竟然只有 1369mAh。除了 iPhone XS 之外，蘋果也為 iPhone 6s/7 智慧型電池護殼，iPhone 6s 版電量是 1877mAh、iPhone 7 版的有 2365mAh。如果 iPhone XS 智慧型電池護殼只有 1369mAh 那麼少，是不足以為 iPhone XS/XS Max/XR 作後備電源之用。
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不過，原本的帖子很快被移除了，原因是實際電量卻不是殼上標明的那麼低。
Deleting this original tweet so that incorrect context doesn’t spread. The XS/Max case’s capacity is 10.1 Wh, compared to 7.13 on the 6 version, and 8.98 on the 7. mAh is lower, but that doesn’t tell the whole story because it doesn’t include voltage. https://t.co/BdqeWpLr3f pic.twitter.com/5T313dfKYt
— Nick Guy (@thenickguy) January 16, 2019
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實際電量原來非常高
在不少 Twitter 網民測試之後，發現 iPhone XS 智慧型電池護殼的電量其實很高，Rene Ritchie 在 Twitter 表示 iPhone XS 智慧型電池護殼有 2 cell 電，舊版只有 1 cell，這會增加 1.4Wh 電量，可換算成 400mAh。
Also, New Battery Cases have more/higher density batteries than previous generations.
They use 2 cells now instead of 1. So, you’re getting around 1.4 additional watt hours and almost 400 more milliamp hours.
BUT power efficiency is WAY more important than quantity these days. pic.twitter.com/VfZCaVWPz8
— Rene Ritchie (@reneritchie) January 16, 2019
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後來 Nick Guy 亦提到 iPhone XS 智慧型電池護殼的電量增加到 10.1Wh，比 iPhone 6s 版的 7.3Wh 和 iPhone 7 版的 8.98Wh 為高。蘋果官網的產品規格頁會用 Wh 顯示產品的電量容量，可見 iPhone XS 智慧型電池護殼的實際電量，遠比保護殼上標示為高。
Some more context: while the mAh rating is lower, the Wh rating (10.1 Wh) is higher because it’s operating at a higher voltage. 7.13 on 6, 8.98 on 7 (they didn’t list V).
My colleague @marksmirniotis goes into the differences between the measurements: https://t.co/BdqeWpLr3f https://t.co/rW9LYJzjzW
— Nick Guy (@thenickguy) January 16, 2019
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