Batteries are considered consumed at
- 500 cycles for iPhones
- 1000 cycles for iPads
- 1000 cycles for Watches
- 300 cycles for A1181 and silver key MBP
- 500 cycles for removable unibody MacBooks
- 1000 for non removable battery MacBooks
If a battery is less than 80% capacity or greater than 80% of its consumed cycle count, it should normally be replaced when refurbishing. If a computer is under warranty only look at the capacity. Anything under 70% will likely perform badly.