关于笔记本的电池

"这个充电周期（full cycle）指的是充电前电池的储电量低于50％。" Charge cycle好像不是这么算的？ Apple的官方说法(http://support.apple.com/kb/HT1519)是：A charge cycle means using all of the battery’s power, but that doesn’t necessarily mean a single charge. 也就是说用完整个电池的电量才算一个charge cycle，不是说充电前电量低于50%就算一个了。比如说第一次用直到剩下80%，充满，继续用直到剩下40%，这样实际上还是一个周期之内的。 For instance, you could use your notebook for an hour or more one day, using half its power, and then recharge it fully. If you did the same thing the next day, it would count as one charge cycle, not two, so you may take several days to complete a cycle. 感觉50%只是Apple举例子的时候方便而已，两个50%正好就100%了，这个50%应该没有特殊的意义的。