If Coconut Battery is reporting that you have 80% or less of design capacity left, your laptop's battery is toast. But you probably already know that, because you are almost assuredly seeing only a fraction of the run-time you saw when your laptop was new.I’m receiving a "service battery" warning. I have a mac book pro 13 “ early 2011. the cycle count is 632. the design capacity according to coconut battery is 66.8%. should I replace the battery?