Amspy123 wrote:
Still, 89% after 105 cycles seems like a great decrease if it should only reach 80% or below after 1000 cycles. At this rate, the battery health would drop below 80% in a few months. I guess I'll change it when it does.
No, Battery Charge Cycles is irrelevant for determining battery health unless the charge cycles are nearing 1,000 cycles which would indicate a well used battery.
With Apple Silicon Macs, macOS now reports on the Battery's Maximum Capacity Percentage just like Coconut Battery reports (FCC or Full Charge Capacity). Coconut Battery does have a logging feature which may show some of the FCC fluctuations mentioned by @John Galt.
Unfortunately Apple made significant changes under the hood where it provides some of the lower level battery details such as the FCC value. I am in the process of writing a custom script to retrieve this information since the easy to use built-in macOS utility I used with Intel Macs now only reports Apple's own Maximum Capacity percentage which is not detailed enough for my testing of the batteries. The only remaining built-in macOS utility providing the FCC information actually provides several different values that at first appear to be the FCC value, but in fact I have had to calculate the FCC value from a coded value to get the real value which matches with what macOS is reporting with the Maximum Capacity percentage. I'm guessing that Coconut Battery may be utilizing one of the other incorrect values...which may explain the huge discrepancy shown. Unfortunately I don't have access to my custom script at the moment to verify & compare Coconut Battery's results. I'm still trying to make sense of this new mess to make sure I'm using the correct value to monitor the battery's FCC value since there is absolutely no documentation on it.
As @John Galt mentioned, Apple won't replace the battery until the Maximum Capacity has dropped somewhere between 77% - 80% (I think with more recent laptops, the number is now closer to 77%). When macOS reports the Battery Condition as "Service Recommended", then Apple will replace the battery for you, or if the Apple Diagnostics report a battery failure. If the Battery Cycle Count is below 1,000 cycles during the warranty period, then Apple will replace the battery for free under warranty. If the battery cycles are about 1,000, then you would need to pay for the battery replacement even under warranty since the battery is considered a consumable item with a limited life span of 1,000 charge cycles.
I wrote some technical details about the Apple batteries and their Maximum Capacity value in this other forum post here:
Battery Health draining fast - Apple Community
Edit: Until it can be proven that Coconut Battery's values are correct, you should only rely on the Maximum Capacity as reported by macOS for the health assessment of the battery. As shown in your screenshots, Apple is reporting the FCC aka Maximum Capacity at 89% of the original Design Capacity. This would place the FCC value at about 4,061 mAh since I believe Coconut Battery is most likely reporting the Design Capacity correctly.
4,563 * .89 = 4,061
I don't recall any issues retrieving the Design Capacity so I believe Coconut Battery is accurately reporting the Design Capacity. I am comparing my results to those on an Intel Mac to confirm I am retrieving the proper values since I can utilize the less built-in utility on the Intel Macs for comparison.
It is possible the FCC value Coconut Battery is retrieving is for the lowest value encountered, so that may show how the battery's FCC is fluctuating. Unfortunately it has been months since I last worked on my script and analyzed any Apple Silicon Batteries.
