Battery issues

It seems I have recently been having problems with my macbooks battery so I thought it might be a good idea to try and get some advice on the matter. So hi my name is Chris

The problem I am having is that my aluminium macbook will randomly cut out even when the battery will have a good 50mins left on the counter. It will not give me any warning and once plugged in it tends to start up without problem. Sometimes I will know it's fully charged (the battery indicator on the side backs this up) and it won't start up without being plugged in. The current readings from istat are...

Health: 41%
Cycles: 361
Charge: 99%

The warranty on it was a 1 year standard which has now ended with it being nearly 2 years old.

Thanks for reading, any advice?

Chris

 

Yes, I tend to calibrate it whenever I get the chance which is usually every 3-4 weeks (and the initial calibrate on purchase). So it would seem that I am best to call apple and see what they say, as I thought the battery would last longer than this