I'm in the same boat except that i bought one used. Battery health was also at 83% when i bought it, don't know what its now but lasting a full day so i dont care.
What do you mean "while you still can"? Will they discontinue battery replacements for the 11 at some point? At 80€ its a no brainer once the battery does start to deteriorate more
Actually I wasn’t aware that you can still get batteries officially replaced on older devices, it looks like they can go back as far as a 5S. I just assumed they cut off battery service once they stop updating iOS on a model.
What do you mean "while you still can"? Will they discontinue battery replacements for the 11 at some point? At 80€ its a no brainer once the battery does start to deteriorate more