I turned in my MacBook Pro 15" Late-2013 to a service shop. The battery indicator recently has said either "Condition: Replace Now" or "Condition: Service Battery" (I can't remember which).
The service shop returned a service cost proposal: after currency conversion $350 USD + VAT including work. Quite expensive.
The reason for the high price is – according to the shop – that the battery on this model is permanently attached to the so called "Top Case" (unibody case + keyboard + trackpad). To replace the battery, the Top Case assembly must be replaced.
I am inclined to reject the service offer, and keep on using the computer with the current battery. What sort of problems can be expected by doing so? Is the computer in any danger in the short or long term?
FYI, MacOS help about battery conditions:
View your battery’s condition: Press and hold the Option key and click the battery icon in the menu bar.
You may see any of the following conditions:
Normal: The battery is functioning normally.
Replace Soon: The battery is functioning normally but holds less charge than it did when it was new.
Replace Now: The battery is functioning normally but holds significantly less charge than it did when it was new. You can continue to use the battery until you replace it without harming your computer.
Service Battery: The battery isn’t functioning normally, and you may or may not notice a change in its behavior or the amount of charge it holds. Take your computer in for service. You can continue to use your battery before it’s checked without harming your computer.