My 2017 MBPO (Touchbar) batter is in pretty poor shape, including the ‘service’ message.
I mostly use this plugged into power, so its not that crucial an issue, though I do occasionally use it away from power and it has limited mite/battery capacity.
I’ve repaired more than a few machines in my time, tough it has been a many years.
My overarching Q related to the left speaker, which died — very crackly — many years ago and I have it muted). Is. It work replacing this at the same time.
My plan is to keep using this laptop until it completely gives up (environmental reasons) as it is capable of doing what I need.