Battery capacity decreases quickly

That your MBP's battery lost 6% in 7 months is somewhat worrisome, especially when you've paid a packet for the machine. Well, I am letting the macOS take care of the power management in mine, but I am using an Intel MBP, still at 91% after 4 1/2 years and with 210 cycles. I am keeping it continuously plugged in as it doesn't leave the desk.The battery % is between 78-80% practically all the time.

It is in Desktop Mode most of the time, which most probably means that the macOS is bypassing the battery most of the time. I don't know if the silicon MacBooks have that mode. I've asked that question, though.

In your case, it appears that you use your MBP away from a power socket. So, try not to let the battery drain less than 20% at most. Whenever you are near a power socket, it maybe prudent to keep the Mac plugged in.

Good day,

The problem with Health is that it is an inexact and unstable metric. It is current battery capacity divided by the design capacity (DC). And therein lies the problem.

Design capacity is the AVERAGE capacity value of all batteries of that model. "Average" always means some individuals will have higher DCs and others lower values, and that affects Health calculations. My 2012 Macbook Pro started life at 102% Health.

As for "unstable," I offer the following data read by the Coconut Battery app over about a year from my Macbook Pro battery, which is today over 10 years old:

Carefully note that, in a 20-day period between 5 June and 25 June, "Health" (in the yellow lines) plummets over 9 points, but then recovers. The numbers are all over.the place.

The battery was nine year old at the time. Only recently at 10-1/2 years old 😳 is the runtime on that battery getting low enough to remind me to take the charger occasionally.

And my computer is too old to have the very clever power management abilities that new Macbook Pros have.

IMHO, variations in Health due to the foibles of the numbers that feed it make Health not worth making withdrawals from your Worry Account. In my opinion that metric exists for one reason. It gives Apple a break point where they can see if a battery will be replaced under warranty. Their gauge has historically been "under 80% at under 1000 cycles" gets a replacement battery IF the computer is under warranty

That said, I always add: if this still concerns you and you are under warranty, by all means have Apple evaluate.

faridmmv wrote:

I never tried to use MBP always plugged in, I keep charge between 10-90%. Usually it takes 8-9 hours of work between charges.

Stop trying to micro manage the poser/charging system. Let the MacOS manage the system. It does so very well. You can leave the computer plugged in whenever convenient to do so. There is no need to drain the battery to 10% or unplug it at 90%.

Yes, I used it on battery time to time, even though it doesn't leave the desk. The last time it worked 7 hours (normal day's work) and, still had 25% of the battery charge. I actually measured it this time. My MBP's official work time is 10 hours on a full battery charge, so interpolating, it still has about 9 hours and 20 minutes, but of course, I'll never drain the battery to zero. The next time, I use it on battery, I'll use it until 30%. Yes, I'llkeep a reminder for that.

MacOS will help, if we help our own machine. 👌

Oh, I couldn't find the "Desktop Mode" anywhere in any documents, support or otherwise, or in any blogs or videos on MacOS/MacBooks. I asked others here about that, too.

Allan Jones wrote:

In my opinion that metric exists for one reason. It gives Apple a break point where they can see if a battery will be replaced under warranty. Their gauge has historically been "under 80% at under 1000 cycles" gets a replacement battery IF the computer is under warranty.

Warranty is a handshake.

But in the EU, it is 2-year legal guarantee. In some EU countries, that law is even tougher. That includes the battery, as the portable computer has to live certain desired years.

Do you have the Optimised Charging Mode enabled?

When your M2Pro MBP is always plugged in, does the battery % fall to 80% and stay there for days?