Laptop shuts down at random times

basically, ive had my macbook pro for over a year, and i havnt treated the battery particularily badly, i almost always charge to full and then drain to nothing, when i checked in more info, it said check battery, so in ringing apple support i was told to re calibrate my battery, did so, and the battery status didnt change, but instead i was left with the problem that my mac shuts down randomly, the other day it shut down at 51% charge (unplugged) and most other times at around 20%,
ridiculous? yes.
anyone got any ideas before i go through the horrible means to get apple to have a look. (plus i cant take it into an apple store till christmas cos there isnt one anywhere near me.

basically, ive had my macbook pro for over a year, and i havnt treated the battery particularily badly, i almost always charge to full and then drain to nothing, when i checked in more info, it said check battery, so in ringing apple support i was told to re calibrate my battery, did so, and the battery status didnt change, but instead i was left with the problem that my mac shuts down randomly, the other day it shut down at 51% charge (unplugged) and most other times at around 20%,
ridiculous? yes.
anyone got any ideas before i go through the horrible means to get apple to have a look. (plus i cant take it into an apple store till christmas cos there isnt one anywhere near me.

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