无论是电池电量不足还是电池故障，Windows都能很好地提醒您笔记本电脑的电池问题。但它究竟是如何发现问题的呢？我们调查时请继续阅读。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

问题

超级用户读者Cam Jackson很好奇他的Windows 7笔记本电脑怎么知道电池坏了：

I have a laptop that’s a little over 5 years old, and I’ve never changed the battery, so I believe Windows 7 when it tells me “there is a problem with your battery”, and to c***ider replacing it.

My question is: how does it detect a dodgy battery? Does the battery not have the same voltage that it used to?

怎么会呢？

答案

超级用户贡献者Tonny解释道：

Laptop batteries have a **all chip inside that controls/monitors the charging process and also monitors the number of charge/recharge cycles.

This chip is factory programmed with information how this sort of battery typically degrades over time.

It also can derive information from the charging cycle itself: The time it takes to reach full-charge at a given voltage/current changes when the battery gets worn out.

(Voltage drop during discharge is not reliable as it depends a lot on the amount of current drawn while discharging, so it varies with the use-pattern of the laptop.)

Windows communicates with this chip to get information about the battery health.

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