MacBook keeps on turning off when unplugged, yet battery health is 86%

"You mentioned that you had water damage a few years ago. My first thought would be that your previous damage is acting up again. If there was any corrosion around the ISL charging chip and it was not thoroughly cleaned after liquid damage, then now - years later + humidity + heat + any other variable could have cut the thread that was holding the system together.

If you are comfortable with it, I would recommend opening the system up and looking around the ISL chip and its resistors that is on the back side of your motherboard - with a magnifine glass or better yet, microscope.

Damage can be easy or hard to spot.

It really sounds like a bad feedback resistor on the battery side of the power in circuit. If you do find damage here, you might want to consider sending your computer out for micro soldering repair, or if you are confident in your own skills and can get the right supplies, you can give it a go by your self first! There are some good videos on line showing what this chip does an how it can be replaced.

Good luck!"

"hi there,

I am having the same problem with my Macbook Air 13 inch late 2015. I spilled some soup last year, but I cleaned it up quickly, and assumed everything was fine. Over the year, the screws on the bottom of the mac fell off and the base became a little loose. Then, after returning to my mac after 1 month+ of inactivity, i found out that the mac randomly turns off when I unplug. I found this discussion really helpful and will try to get my mac to a computer shop. It’s a school computer, but idk if the IT can be able to fix it."

I'd try an SMC reset to start things off. This normally fixes standard battery issues.

"Having this same problem with a mid 2010. I had had both the battery AND the logic board replaced under the little known video card problem just before the 5 year warranty expired as I paid the $300 lump sum. I took it back claiming that the parts should have had at least some kind of their own repair warranty with no luck.

I have also tried the SMC and PRAM multiple times.

Sometimes the battery disappears form the upper right in the screen, other times the Wireless icon disappears.

I have upgraded to a solid state but there were no problems up until I had all of the warrantied items replaced.....

Help!"

"Hey Yavuz,

Did you manage to solve your Macbook Air battery problem where the Macbook keeps turning off when unplugged? I have the same Macbook Air 13"" Mid 2012 model that experienced this problem after a new battery replacement ordered from iFixit."