https://wccftech.com/apple-watch-series-4-smaller-battery-capacity/

The Apple Watch Series 4 finally gets a design change and with that change, the company has incorporated the brand new 64-bit capable S4 chipset and slimmer bezels. However, on Apple’s website, it has been listed that the Apple Watch Series 4 is able to provide an 18-hour battery life on average. Now, thanks to some eagle-eyed readers, the Apple’s Product Information Sheet pointed out some very interesting figures, one, in particular, being that the Apple Watch Series 4 sports a smaller battery for both models.

According to MacRumors’ readers, based on the document, the Apple Watch Series 4 actually feature smaller batteries than the equivalent Apple Watch Series 3 variants. When it comes to comparing both wearables, the 44mm version of the Apple Watch Series 4 sports a 1.12Whr cell, while the 42mm Series 3 model sports a bigger 1.34Whr capacity.