If you have installed any. Next, go to settings and turn on the power saving option. The battery saver provided on Huawei P Smart (2019) by the manufacturer will actually work. Then, turn off location services when not in need. Also, use mobile data network on the Android phone only when needed. This sucks up your battery very quickly.
Speaking of the update, the latest EMUI 12 interface for Huawei P smart 2019 models in Europe bears the build version 12.0.0.225 (C432E3R4P2). Alongside, the update carries a software package that is 305 MB for beta users and ranges between 1GB to 4GB for non-beta users. To upgrade your phone manually, go to Settings > System & Updatesa54tYm.