How can I re-calibrate MacBook Pro 14" M4 (macOS 15.2) battery

loadaverage wrote:

But all laptops in my life (Sony, Asus, etc) were precise with battery data, e.g. when I saw 30% it was really 30% of charge left,

How do you know?

Oh yes, I bought a macbook m1 pro in November, and this week I had the same problem.

I do not know what to do, yesterday it turned off by 19%, today by 28%.

There is little information on the Internet, I do not know how to do the right thing.

You misunderstood me.

Everything you've written is super obvious.

The only thing is, I don't use power-consuming apps on my MacBook, and I know how the system works.

I didn't have any problems for 2 months, and then suddenly it appeared, but nothing changed in the work scenario, as I didn't use power-consuming applications, and I don't use them now.

You misunderstood me, I don't need to always connect my MacBook to the network, there is a problem that it turns off at 20 percent without warning, that's the whole problem, but not the power consumption, and that's what you described.

<< What do you mean by "always"? >>

"In general, you should ALWAYS connect a power source when it is possible to do so, and only run on batteries (which could be somewhat slower) when no power sources are at hand. Your Mac maintains its battery charge levels under program control, and will NEVER over-charge. "

So when you arrive at a new location, you look around and find a power outlet. You sit closer to it. You plug in your power adapter.

When you put your computer down for the night, you make certain that the power adapter is connected.

If the cord is too short, Apple sells an AC 'extension cord' for your power adapter for about US$20.

Your battery will have a longer lifetime if you don't run it down so low.

loadaverage wrote:

Thanks for the information, but I don't see how this is connected to wrong estimated charge displayed on macOS?

The fullness ESTIMATE is sometimes made MUCH worse by tiny internal weaknesses in the individual cells that make up a Mac battery. Suppose one or more cells are getting weak. When the charge level of the group approaches some threshold, say, 20 percent, the total output of the battery could collapse suddenly if ALL the component cells can not carry their part of the load.

The Estimate will not change immediately. But your behavior must change, or it will catch you again and again and again.

if you keep your MacBook at a higher change levels in general, you will rarely care when it says the charge level is low, and exactly how low.

Batteries are a wear item, like the soles of your shoes and the tires on your car. Their expected lifetime depends on use (as reflected in Charge cycles) and also in the passage of time, used or not. After a while, you should expect to have to replace the battery. 

Battery life  also depends on two factors you may be able to control a bit better. Lithium polymer batteries deteriorate when they get too hot, and when they are subject to very deep discharge. These should be avoided when possible.

Despite using these batteries in millions of Apple devices, there is still a lot of of randomness in exactly which battery will fail when.

Apple SUGGESTS (but does not Warrant) that your battery MAY last as long as 1000 charge cycles, provided all other factors are well-controlled.

Apple uses the criterion that a battery that doesn't to hold 80 percent of its original charge capacity should be serviced, and likely replaced. By definition, other batteries are WORKING as designed.

Apple does not provide ANY support for a situation where weak a cell might cause the battery to lower its capacity in a burst, causing it to decline rapidly and shutdown suddenly at the low end of its capacity.

You are welcome to ask Apple support to provide you a new battery. I expect they refuse, and will remind you that Apple's policy is that a battery the holds 80 percent of its original charge is defined as WORKING.

Apple support representatives are trained to be Nice to you, so they will not tell you to stop using it that way. Since I am not an Apple employee, I am free to blurt out the Truth.

I agree, I usually charge when I see 19%

But a couple of times, I was "working hard", and I didn't notice how the charge level dropped to 1-5%, and everything was fine, it didn't turn off.