Chinese apps are less optimized than western

if you run out of smartphone battery you are in much bigger trouble in China than in west since it's necessary to function almost everywhere, which is why they have rental powerbanks stand literally in every restaurant and every small grocery shop, you are never further than like 5 minutes walk from one in urban area

btw you can always put app to protected/not optimized list which usually solve problems with most of the western apps on Chinese phones (essential Chinese apps like WeChat are on the list by default)