We already know the secret to the huge battery life of the Apple Watch Ultra.

The Apple Watch Ultra promises unparalleled battery life. Compared to the Apple Watch Series 8 and SE, its battery life has increased from a theoretical 18 hours to twice as long, 36 hours in low consumption mode. This is a very important leap from one of the The most criticized features of the Apple Watch: its autonomy.

But what is the secret of improvements? It’s not so much about improving efficiency, since the chip that drives both devices (Series 8 and Ultra) is the same, and one doubles the battery in the other. The reason is its size. Apple Watch Ultra is bigger than Series 8, but not Twice as big to have twice the battery.

Now, thanks to the certification of the device, we know for sure that its battery is larger. How much? A lot more. The Apple Watch Ultra has a 542mAh battery compared to the 45mm Apple Watch Series 8 with a 308mAh battery. This is 76% more in size and capacity than previous models. for “Apple Watch Ultra” compared to the larger standard Apple Watch.

Apple Watch Series 7 and Series 8 use the same battery and the same processor.

But this is not the only surprise. The certification documents also confirm that the “Apple Watch Series 8” is equipped with the same processor as the Series 6 and 7, and the new Apple Watch also has the same battery size.

For its part, the 41mm Apple Watch Series 8 has battery capacity 282 mAh, while the same size Series 7 packs a 284mAh battery. The change is so small that a user using the watch normally won’t notice much of a difference in battery life. The same applies to watches with a diameter of 45 mm.

In contrast, SE, due to the fact that it does not have an always-on screen or blood oxygen monitoring, requires less energy. That’s why it’s capable of offering the same autonomy as the Series 8 with a smaller battery. In the case of the 40mm version, it remains at 245mAh, while the 44mm version has a 296mAh battery.