I have a 2008 unibody MacBook. It is 6 years old in May so I will probably be upgrading to a MBP soon. I'm worried that the battery isn't replaceable. My current macbook is on its second battery. The first one died after about a year and a half and I was forced to replace it as it would drain to 40% within half an hour then abruptly turn off. I tried to argue it with Apple as at the time the website stated that with 300 charge cycles it would still retain 80% of its capacity. When really it died with about 250 charge cycles. I think they should have given me a free one as the battery didn't perform as sold. Now on my second battery at 205 charge cycles, it jumps between percentages so it can have 58% then a few moments later it will say 61% and only lasts a couple of hours at best. I really like Macs but I am worried that if I get a new one I will be forced to replace the battery a couple of times over its lifetime. Any thoughts on this?