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ALAN HENRY2017年10月27日

https://cn.nytstyle.com/technology/20171027/five-tech-myths-people-still-believe/en-us/

誤解二：應該在電量耗盡後再充電

電量耗盡後再充電的觀念是有合理根源的，但它不適用於當前的技術。多年前，鎳氫和鎳鎘電池很常見，它們有一個被稱為「電池記憶」的問題：除非在充電前將電量完全耗盡，否則它會「記住」自己用了多少電量，只會再充那麼多電。如果在一段時間內多次重複，那麼電池將永遠不能再完全充滿電。

Myth 2: A battery should be at zero before you recharge it

The idea that you should always completely discharge a battery before charging it up again has legitimate origins, but it doesn’t apply to current technology. Years ago, when nickel–metal hydride (NiMH) and nickel-cadmium (NiCad) batteries were common, they suffered from an issue called “battery memory”: Unless the battery was completely spent before being recharged, it would “remember” how much power it had used and only charge back up that amount. If done repeatedly over time, the battery would never charge totally again.

幸運的是，現在你的手機或筆記本電腦很可能配的是鋰離子電池，它並沒有這個問題，至少沒多大影響。事實上，對鋰離子電池來說，把電量耗盡再充電弊大於利，因為在它不能完全充電之前，它的充電「週期」次數（指的是完全放電和充電的次數）是有限的。

Fortunately, the lithium-ion (Li-ion) battery that’s probably in your phone or laptop right now doesn’t suffer from this issue, at least not in any significant way. In fact, with Li-ion batteries, you can actually do more harm than good by letting them die before charging them again, because they have a limited number of charge “cycles” (meaning times you can completely discharge and recharge them) before batteries start to hold less overall power.

幸運的是，據電池大學公司(Battery University)稱，解決方法很簡單：在電池完全沒電之前，經常給它們充電。這種所謂的「淺層放電」意味著，如果你使用手機幾個小時後就給它充電，或者在沙發上工作幾個小時後就給筆記本電腦充電，那麼你就沒有完成一個完整的充電週期。事實上，現代電池最大的敵人是溫度。越是能讓你的電池保持清涼——不管是充電時還是使用時——它的壽命越長。

Luckily, according to Battery University, the solution is pretty simple: Charge your devices from time to time before they fully die. These so-called shallow discharges mean you don’t use a full charge cycle every time you top off your phone after carrying it for a few hours or plug in your laptop after working on the couch for the afternoon. In reality, the biggest enemy of modern batteries is temperature. The cooler you can keep your battery, either while charging it or while it’s in use, the more you can prolong its life.