当你的MacBook超过了最大充电循环次数后，电池的性能就会逐渐退化（损耗）。
如果你拥有一台 MacBook，你需要关注的其中一个问题就是电池的寿命又或者说是健康状况。当你的 MacBook 超过了最大充电循环次数后，电池的性能就会逐渐退化，也就是电池越来越不耐用。
如果你完全将 MacBook 充满到 100%的电量，然后用到电池耗尽，这就为一次充电循环。如果电量剩余 50% 的时候你又让 MacBook 充满到 100%，那么当电量低于 50%的时候，就会又计算为一次充电循环。
所有 MacBook 的电池都和其它带锂离子电池的便携物体一样有着有限的充电循环次数。一旦设备电池超过充电循环次数的最大值，电池就会开始退化，这时候也就可以考虑换电池了。
那么如何在 Mac 上查看电池充电循环次数呢？
1.按住键盘上的 Option 键并点击菜单栏上的苹果 logo
2.从菜单顶部点击“系统信息”，然后从侧边栏找到“电源”按钮
3.最后在“电池状况”找到“健康信息”
4.在这里你就可以看到 Mac 的电池循环次数，以下是苹果所提供的各款 MacBook 的电池最大循环次数，大家不妨参考参考。超过这些循环次数，你就可以考虑换电池了。
1000 次循环
MacBook (Retina, 12-inch, Early 2016)
MacBook (Retina, 12-inch, Early 2015)
MacBook (13-inch, Mid 2010)
MacBook (13-inch, Late 2009)
MacBook Pro (Retina, 13-inch, Early 2015)
MacBook Pro (Retina, 13-inch, Mid 2014)
MacBook Pro (Retina, 13-inch, Late 2013)
MacBook Pro (Retina, 13-inch, Early 2013)
MacBook Pro (Retina, 13-inch, Late 2012)
MacBook Pro (13-inch, Mid 2012)
MacBook Pro (13-inch, Late 2011)
MacBook Pro (13-inch, Early 2011)
MacBook Pro (13-inch, Mid 2010)
MacBook Pro (13-inch, Mid 2009)
MacBook Pro (Retina, 15-inch, Mid 2015)
MacBook Pro (Retina, 15-inch, Mid 2014)
MacBook Pro (Retina, 15-inch, Late 2013)
MacBook Pro (Retina, 15-inch, Early 2013)
MacBook Pro (Retina, Mid 2012)
MacBook Pro (15-inch, Mid 2012)
MacBook Pro (15-inch, Late 2011)
MacBook Pro (15-inch, Early 2011)
MacBook Pro (15-inch, Mid 2010)
MacBook Pro (15-inch, 2.53 GHz, Mid 2009)
MacBook Pro (15-inch Mid 2009)
MacBook Pro (17-inch, Late 2011)
MacBook Pro (17-inch, Early 2011)
MacBook Pro (17-inch, Mid 2010)
MacBook Pro (17-inch, Mid 2009)
MacBook Pro (17-inch, Early 2009)
MacBook Air (11-inch, Early 2015)
MacBook Air (11-inch, Early 2014)
MacBook Air (11-inch, Mid 2013)
MacBook Air (11-inch, Mid 2012)
MacBook Air (11-inch, Mid 2011)
MacBook Air (11-inch, Late 2010)
MacBook Air (13-inch, Early 2015)
MacBook Air (13-inch, Early 2014)
MacBook Air (13-inch, Mid 2013)
MacBook Air (13-inch, Mid 2012)
MacBook Air (13-inch, Mid 2011)
MacBook Air (13-inch, Late 2010)
500 次循环
MacBook Air (Mid 2009)
MacBook (13-inch 铝合金, Late 2008)
MacBook Pro (15-inch Late 2008)
300 次循环
MacBook (Mid 2009)
MacBook (Early 2009)
MacBook (Late 2008)
MacBook (Early 2008)
MacBook (Late 2007)
MacBook (Mid 2007)
MacBook (Late 2006)
MacBook (13-inch)
MacBook Pro (15-inch, Early 2008)
MacBook Pro (15-inch, 2.4/2.2GHz)
MacBook Pro (15-inch, Core 2 Duo)
MacBook Pro (15-inch 光面)
MacBook Pro (15-inch)
MacBook Pro (17-inch, Late 2008)
MacBook Pro (17-inch, Early 2008)
MacBook Pro (17-inch, 2.4GHz)
MacBook Pro (17-inch Core 2 Duo)
MacBook Pro (17-inch)
MacBook Air (Late 2008)
MacBook Air
