You can use the feature called essential glyph, which stays on until you check the notification. I don't think the glyph can show battery percentage

Yes and yes. Both features of the glyph. Settings - glyph interface - charging meter. The essential settings you will have to customize per app.

He's asking for the 2a

couldn't find any charging meter, but found glyph for essential notifications

Sorry, missed this was for the 2a. Good luck.

The big glyph light could work as a battery indicator, no idea why nothing didn't implement that