The good news is that the MateBook 13 uses standard USB Type-C charging, so there's a huge ecosystem of third-party batteries you can carry with you.
Doesn't that defeat the purpose of an ultrabook? Might as well just get a thicker laptop with a good built in battery. Huaweii should have just made it a few mm thicker and used a larger battery. They got too focused on thin and light. Hobbling the portability aspects of the computer.