Huawei's latest range of premium phablets launched with 4G/LTE-only versions of their flagship-grade chipsets due to the US governmental embargoes under which the OEM operates. However, according to an eminent leaker, a Mate 50 customer may now buy a new third-party accessory that confers sub-6GHz connectivity to the device. The cases are even equipped with their own chipset for this purpose.https://www.notebookcheck.net/Huawei-Mate-50-series-compatible-5G-cases-are-released-in-China.655188.0.html
Without integrated battery in these cases , battery life is gonna be bad.