Chinese blogger Yang Changshun made a large-scale modification of the iPhone 13 Pro Max.
He attached a frame from another iPhone to the smartphone case. On it, he placed a second battery, two fans for cooling the battery, USB-C for charging and a 3.5 mm audio jack.
He connected all new components to the motherboard of the device.
iOS recognized the second battery. With it, 13 Pro Max works twice as long.
In Antutu, a pumped iPhone scores 150,000 points more thanks to additional cooling and an increased battery.
The new parts did not affect the operation of native iPhone components. For example, Lightning is still used to charge the built-in battery. The smartphone lost only wireless charging and water protection, as the case became half open. [Weibo]