I am currently using a four-year-old Macbook Pro and the battery doesn't work at all. It lasts about five minutes while the laptop is not plugged in and the battery will randomly fail and shut down even while it is plugged in. It would cost me $200 or more to fix it. The Macbook doesn't work nearly as well as it used to so I'm wondering if I'm better off just getting a new laptop instead of repairing this one when it may have another problem in the near future. Thoughts?