Disassembling the Apple Watch Series 4

Batteries in the Apple Watches Series 4 are smaller than the previous ones, actually

On Monday, we brought here the dismantling of Apple Watch Series 4 made by iFixit and we highlight the comment made by the firm that the new watches brought batteries bigger than their previous versions. Well, apparently it’s not quite the case.

IFixit, in its teardown, stated that the new devices had approximately 4% larger batteries than their predecessors, but the statement is based on the comparison of a 38mm Apple Watch Series 3 with a 44mm Series 4, which is obviously not appropriate.

Disassembling the Apple Watch Series 4

To resolve doubts, the MacRumors brought up a document (little known, by the way) kept and updated frequently by Apple called Product Information Sheet [PDF], a product information table that, for legal and safety reasons, gathers technical data on the batteries of all devices manufactured by the company. In it, we can make a real comparison about the battery capacities in Apple Watches.

While the Series 3 version of the 38mm watch has a 1.07 watt-hour battery, the Series 4 40mm (which is equivalent) has a 0.86 watt-hours. In the case of larger models, the old version has a 1.34 watt-hour battery, against 1.12 watt-hours on the latest model. That is, we have a drop in 19.7% in smaller models and 16.5% in the bigger ones.

The reason, although not officially explained, is not difficult to guess: by working with a thinner housing, Apple was forced to decrease the size of the batteries in the new Watches a little. The good thing is that, even with the drop, the new watches have autonomy similar to their predecessors, due to optimizations in the processor, screen and system – just like the iPhone XS in relation to the X.

We will see, over time, if the promise of the Apple is reflected in reality.