The iPhone 8 has a smaller battery compared to the iPhone 7

Apple’s iPhone 8’s battery is up to 8% smaller than the battery on last year’s iPhone 7, despite Apple boasting on the new phone’s similar battery life.

The Chinese wireless regulator, TENAA, published figured that showed that the batteries in the iPhone 8 and 8 Plus have capacities of about 1,821 and 2,675 milliampere hours (mAh) respectively, compared to the iPhone 7 and 7 Plus’ 1,900 and 2,900 mA.

Apple, which tends to concentrate on battery performance rather than technical specifications, says that its new iPhones last “about the same” as their predecessors. This is possibly a result of a more efficient processor in the new devices.

Apple often changes the size of the batteries of its iPhones, even on models with the same dimensions. For example, when the company released the iPhone 6s two years ago, the battery was a bit smaller than its predecessor to make room for the introduction of 3D Touch. The absence of the headphone jack in the iPhone 7 last year meant that Apple was able to fit in a larger battery.

It is still unclear why the tech giant has made the size of the battery in the iPhone 8 smaller, but space is always at a premium inside smartphones. Since the battery is one of the phone’s biggest components, new additions to the phone often require shaving down its size.

The smaller battery of the iPhone 8 may be down to its wireless charging technology, which requires an electromagnetic coil connected to the battery to be fitted inside the phone. The iPhone 8 and 8 Plus also have fast charging, unlike the iPhone 7, which may have an effect on the energy density battery.

Even though bigger batteries tend to imply longer battery life, milliampere hours are not a wholly reliable indication of how long a battery can actually last.

For example, Samsung’s Galaxy Note 8, has a 3,300 mAh battery, bigger by 23pc than the iPhone 8 Plus, but both the phones have almost identical talk times reported at 22 hours and 21 hours respectively.

The type of screen, power management software, and the efficiency of the processors inside the phone all contribute to a difference to battery life.