So I have a 2009 Macbook Pro. The machine is still running great and the battery has been pretty terrific for the last four years, but this week a little sign popped up saying "service battery". It has had 700 charge cycles and the health is 78%, so it's not as if I've stressed the battery too much. The capacity has definitely dropped so I'm assuming the battery has somehow failed. Has anybody else experienced this and did they find a fix? Thanks.