Aluminium Macbook Battery Fluctuations

[minky1234]

I have a 2 year old aluminium macbook and have recently been having problems with the battery.

Sometimes when running off the battery alone, at around 20% battery remaining (or so it says) my macbook suddenly shuts off. After I start it back up the indicator says there is no charge left and shortly shuts down again. After plugging in the charger and checking coconut battery my battery health is suddenly 40% less than the last time I checked.

Has anyone had this problem? I don't have apple care either, so is it just time for a new battery?

 

[spinnerlys]

Have you calibrated your battery regularly?


Apple on notebook batteries
Apple Portable: Calibrating your computer's battery for best performance

 

[celticpride678]

Usually you need to calibrate our battery or reset the SMC to get more accurate numbers.

 

[minky1234]

Yeah I calibrate it frequently, I'll try resetting the SMC