小编用了 MacBook Air 已经两年，虽然未至于严重损坏，但电量似乎比两年前不再耐用，电池用了两年，电池始终会下降，如何可以查看 MacBook 的电池是否到了极限？

长按 Option 键再打开屏幕左上角的  选单，按「系统信息……」。打开 MacBook Air 的窗口后按左边的「电源」，你会看到「健康状态信息」中的「循环使用次数」，就可以看到你的 MacBook 电池「被完全充电」的次数。

看这些次数有什么作用？MacBook 电池作为锂充电池，充电次数有上限，超过上限之后，电池的实际容量会越来越少，这时候就会换电池了。苹果的支持网站其实列出了过去众多型号的 MacBook 电池， MacBook Pro（Early 2009）、MacBook Air (Late 2010) 、Retina MacBook 或以后的 MacBook 型号，充电循环上限固定为 1000 次，而较旧款的型号则为 500 次和 300 次。想知道，可参见下面的列表。

电池循环使用次数上限是 1000 次

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)

电池循环使用次数上限是 500 次

MacBook Air (Mid 2009)

MacBook (13-inch Aluminum, Late 2008)

MacBook Pro (15-inch Late 2008)

电池循环使用次数上限是 300 次

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 Glossy)

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