1 - 2 minutos
My Late 2008 Macbook pro had developed a swollen battery after about 3 years of service. The trackpad would not click properly and the battery life was really poor (less than 1 hour on a full charge).
Easy. Just pop in the new battery and I was done.
I'm not sure why but my replacement battery has swollen as well after about a year. I guess my advice would be to not own one of these unless you are prepared to replace the batteries regularly.