Mac turns off suddenly when not charging. No low bat

[lilith2014]

Good day,

My mac (unibody aluminium) is turning off suddenly when is not charging. Sometimes goes off when is 50% batt remaining sometimes around 78%. The battery is new, It has 31 cycles, 86% health.

I already reseted the computer (taking battery out and pressing the power button 5 secs) but is not working. Some articles says it may be the OS (i have snow leopard).

What should I do?

 

[awer25]

Open the bottom cover and make sure the battery connector is properly connected.

 

[deadwulfe]

Try calibrating the battery as detailed in the Apple Notebook Battery FAQ.

 

[lilith2014]

Thank you for your responses but I have tried those two suggestions before. The problem is that if I am working on my mac without the charger, the computer turns off without any warning and the battery percentage is not always the same (it never last more than 50%).

 

[GGJstudios]

Thank you for your responses but I have tried those two suggestions before. The problem is that if I am working on my mac without the charger, the computer turns off without any warning and the battery percentage is not always the same (it never last more than 50%).

Try resetting the SMC.

 

[Koodauw]

It has been my experience that it is most likely a bad battery. I had the same problem several years back with old aluminium Powerbooks, and Mac Book Pro. ( 2 different machines, same problem) Each time Apple would send me a new battery, and that took care of the problem on one of the machines, the other one they never could figure out.

 

[seinman]

Try calibrating it, as mentioned above. If that doesn't work, then this is most certainly a bad battery, seeing as it is reporting only 86% health after a mere 31 cycles. Mine is still in the high 80s after 500 cycles, and my last battery was hovering around 90% after 300. Get it replaced.