I’m having your same original problem. And I just bought MBP 13 in June - about 4 months ago. But I use excessively all day doing cloud computing database work, and evenings watching YouTube movies whatever. That battery is like 4 years old in battery years since it’s been working 16-20 hrs a day for 4 months. If there’s a chance this level of use will ruin my system beyond the battery - I better find out now b4 too late. [br]
THANKS this was very helpful. Heading to Apple store for a level 5 diagnostic. Lol #trekkie