1 
2 Shutdown suddenly with >50% battery
Hi
I'm having issues sometimes with a new battery. In Genius Bar check correct battery health.
The problem is that the battery state changes from goog to poor state and the system suddenly stops using it . Have or not the charger, stop using it. So if you do not realize and disconnect the charger turns off and if you have the charger turns off directly .
When this issue occur it's necessary make a smc restart and wait to fully battery charge. Otherwise battery seems dead.
In powermanagement log,
Feb 24 02:33:59 MacBook-Air-de-migue powerd[56] <Notice>: Battery health: Poor; was: Good; reason Permanent Battery Failure
Feb 24 02:44:05 localhost powerd[56] <Notice>: Battery health: Poor
Feb 24 02:44:07 localhost powerd[56] <Notice>: powerd process is started
Feb 24 02:44:07 localhost powerd[56] <Notice>: Summary- [System: No Assertions] Using AC(Charge: 77)
Versión de la ROM de arranque: MBA51.00EF.B04
Versión SMC (sistema): 2.4f19
I appreciate any help .
Thanks
Update (02/27/2016)
I made the snaps with the 'poor' indicator, this time when I remove the charger not turned off. I have made a smc reset and take new snaps with battery state 'good'.
Before SMC reset with magsafe
Before SMC reset battery
After SMC reset with magsafe
After SMC reset battery
Is this a good question?
970 
10 Comments
It just seems as if your battery is dead sadly because something like this happened to my air a while back
Would just shut off at random battery % mainly from 60/50-30 if I wasn't careful ID lose work
So I change battery all is good
by Alex Hus
I'm not sure it's for that reason. Just happen again at 91% battery.
Today steps:
- I start working at 100% battery
- It is discharged to 88%, the connect and I'm still working
- At 100% disconnected and I work for a while
- Goes out (I did not notice indicating the load) when starting battery 91%
- Indicates status "change battery now"
The same thing happened to me on another occasion when I work for all morning with magsafe connected, and when disconnect the magsafe goes power off.
It is as if for an indeterminate event changes battery status to "change battery now" and disables battery, which only has power magsafe.
Chip SMC??
Only battery??
by Migue Hinojosa
That sounds like you need to replace the battery
by Cody Rozema
Please install this app: CoconetBattery. Take a screenshot of the screen so we can see the details. You'll need to do this with the charger plugged in and a second snap when on battery alone. Paste the images into your question.
Have you done a SMC reset yet? If not follow this Apple T/N: Reset the System Management Controller (SMC) on your Mac Did that help?
by Dan
Yes, I think, it is the battery. But before buying another, I want to be sure that is not the logic board or a common problem that I did not know.
Yes, I've done reset the SMC. When happens is the only way to recover the macbook.
I update the question with screenshots.
by Migue Hinojosa
Show 5 more comments