Like a yellow fever shot. It hurt like hell and made me sick but compared to doing without the "discomfort" is a picnic. Stiff upper lip. Take it like a man. It hurts now but you will worship how it simplifies battery management later on. The Chinese clones have to prove themselves. If say DROK came out with a function bi-directional amp hour meter I would take note.
And with MY poverty income the cost of an amp hour meter is like one of you folks buying a car. It hurt but it feels soooo gooood later on. No guesswork.