Macbook pro battery charging matter

Yesterday evening, I decided to shut down the MBP at night with 100% battery. In the morning today, at 8:45 the battery had that 100% charge. So, decided to use it on battery to check how it is faring. Same work/usage as in a normal day. At 14:45, that's 6 hours later, the battery charge was 35%. Well, not bad for a made in April 2019, but officially a 2018 15" MBP, nearly 4 and half year old battery. Cycle count 209. Temperature level stays between 26.5-28.5°C.

Once, the MBP battery reaches 20%, it'll be charged and will go back to the optimised charging cycle for next few weeks. If the MacOS/MBP remembers how I use it, then it'd fall back to 80% and to the Desktop Mode. I hope. :)

What's also interesting is that the battery capacity had gone up by ~3.5%! So, it appears that resting the MBP is advantageous for the battery -- not sleeping and connected to power, nor just sleeping on battery -- just simple resting fully shut off. 😊👍

Instead of shutting down the MBP for the night, I left it sleeping and on power adapter at 80% battery charge, which was there the whole of yesterday. Now I have a new communique from the optimised charging mode. Quite interesting one at that.

well, have to wait and see, what it'll do at 14:30 and for the rest of the day.

You see, I never cared/worried much about battery capacity when I was using Linux and Windows. We have Linux/Windows laptops that has the FCC less than 75%, more than 1400 cycles, but some of them (Lenovo and Medion) ~5 hours on battery, and there is an Acer Swift that runs > 10 hours. I just got involved in this battery charging "madness" only after buying an Intel Mac. Anyway, I like the Mac, especially MacOS apps - very easy to use.

Coming back to our matter, the FCC had gone up that 3.5% and stays there since I reported it here, the FCC fluctuating by 0.1% up and down time to time. 😊

HWTech wrote:

I don't have enough experience of monitoring of the Battery Capacity percentage or FCC with Apple Silicon Macs, but I have studied the battery behavior with Apple Intel laptops.

Thank you for taking time to reply. I'm glad for any insight on this matter. I'm not going to worry about the battery of my MBP, but it had just become a pastime. I'm sure it is going to last another 4.5 years. After all, it was high-end when first sold by Apple. 😊

1% dropped again...

Interesting how far it'd drop... :)

Today, Thursday, at ~9:10 the battery charge returned to 80%,

Have to watch what happens in the near future... :)

I suppose, the Optimised Charging is working quite well with Sonoma!

Now it is past 17:30 here, the battery level is still at 78%, and the MBP is in "Charging on hold: Desktop Mode." Checked with Apple Support site,

and, nothing much other than that. Good that Apple states that the Mac will delay charging past 80%, but doesn't say that it might be, say, 60%, as though they themselves are not that sure.

This MBP will go to sleep ~23:00, what if tomorrow it will drop to 77%? Had anyone had a situation, where the battery level dropped to 60-70% while in the Desktop Mode?

Maybe Sonoma has a better attitude for optimised charging? At the end of the week, I'll send a feedback to Apple.