Nintendo has sold almost 4.7 million Switch units in the four months since the system launched in March, so it’s safe to say the console is a success. But it’s still plagued with a few system issues — one of which Nintendo fixed (kind of). If users update the operating system to the latest version (3.0.1), the console will finally display the correct charge level on screen. Usually. If not, they can follow extensive instructions to charge then drain the battery, which will gradually fix it. Hopefully.
Source: Nintendo (Issue resolution page)